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A Stamp printed in USA devoted to 500th anniv. of the printing of the 1st book, the Holy Bible, by Johann Gutenberg, circa 1952
High resolution photograph of a detail from a portrait of an Turkish ottoman Janissary  soldier carrying red flag 16th Century
3d rendering of jigsaw pieces assembly Christianity cross
Jigsaw puzzle needs the final piece as a solution to a problem or challenge.
Bulgarian currency BGN banknote, 20 leva
Vintage postcard sent from Tokyo, Japan in early 1900s, a very good background for any usage of the historic postcard communications.
Old money of the USSR close-up. Macro photography of vintage banknotes of the Soviet Union, retro details
Scene from the Ballet \
North korean stamp from 1971. North Korean Stamp illustrating Northern Korea culture
Vintage book of 1794 first inner page
News headline that says \
German national flag printed on a jigsaw puzzle with lots of texture, representing a government or political problem to be solved.
USSR- CIRCA 1990:  A stamp printed in the USSR shows a performance of Pyotr Tchaikovsky's opera Iolanta, circa 1990.
Vintage photograph of the USS Baltimore (C-3) a United States Navy protected cruiser
Old USSR money close-up on a white background, isolated banknotes. Macro photography of retro banknotes of the Soviet Union, vintage details
Wheat Frame on Pattern Design on Banknote
Mesa Verde on old US stamp of 1935
Front of an expired, obsolete Dutch ID / passport, issued during WW2, in november 1941
white started puzzle with uncompleted center on dark wooden background
French national flag printed on a jigsaw puzzle with lots of texture, representing a government or political problem to be solved.
Nietzsche Archive from German money - mark
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White jigsaw puzzle. White puzzle pieces on color background. Unfinished white jigsaw puzzle pieces on color background.
Pattern Design on Banknote
IRAQ - CIRCA 1932: A stamp printed in Iraq shows Faisal I of Iraq, circa 1932
Puzzle with missing piece on red background
Postage stamp printed in India shows Map of India, 1957
Jigsaw puzzle needs the final piece as a solution to a problem or challenge.
Ship - sailing from Scottish money - pounds
An old British National Savings Certificates book and Holder’s Card c1940s.
Free Images: "bestof:Shoomkoff 1905 The Macedonian Problem.jpg en The cover of the book The Macedonian Problem and its Proper Solution published in 1904 1904 scanned Stanislav"
Gustave_Wappers_-_Épisode_des_Journées_de_septembre_1830_sur_la_place_de_l'Hôtel_de_Ville_de_Bruxelles.jpg
Denslow's Humpty Dumpty 1904.jpg
Dagestani man and woman.jpg
Hanna_book_cover.jpg
Muybridge_Buffalo_galloping.gif
Muybridge_race_horse_animated.gif
Alexander Konstantinovich Sheller.jpg
Muybridge_race_horse_animated_184px.gif
Edgar_Allan_Poe_2.jpg
Alectroenas_sganzini_1868.jpg
Watery_Sunset.jpg
Pico Humboldt Venezuela cut.jpg
Erdfunkstelle Fuchsstadt - 18-Meter-Antenne.jpg
Panorama_of_San_Francisco_by_Eadweard_Muybridge,_1878.jpg
God_Appears_in_Gigantic_Form.png
Graham_Wallas_(right),_K.B._Smellie_(left),_1925.jpg
Daedongyeojido-full.jpg
Wappers - Episodes from September Days 1830 on the Place de l’Hôtel de Ville in Brussels.JPG
moser_animal_motif_picture_book_c_1904.jpg
moser_animal_motif_picture_book_1_c_1904.jpg
3SAT reduced too VC(1).svg
Pittsburgh newspaper consolidation timeline.svg
CPT-halting-dual.svg
Wikipedia-books-missing-cover-mk.svg
moser_picture_book_niece_dith_mautner_von_markhof_1904_9_1904.jpg
moser_picture_book_niece_dith_mautner_von_markhof_1904_8_1904.jpg
moser_picture_book_niece_dith_mautner_von_markhof_1904_7_1904.jpg
moser_picture_book_niece_dith_mautner_von_markhof_1904_5_1904.jpg
moser_picture_book_niece_dith_mautner_von_markhof_1904_4_1904.jpg
moser_picture_book_niece_dith_mautner_von_markhof_1904_3_1904.jpg
moser_picture_book_niece_dith_mautner_von_markhof_1904_2_1904.jpg
moser_picture_book_niece_dith_mautner_von_markhof_1904_11_1904.jpg
moser_picture_book_niece_dith_mautner_von_markhof_1904_10_1904.jpg
moser_picture_book_niece_dith_mautner_von_markhof_1904.jpg
moser_picture_book_niece_dith_mautner_von_markhof_1904_1_1904.jpg
AOKI-Gifts-sea-1906.jpg
Finite element triangulation.svg
Hans Gude--Fiskerbarn Chiemsee--1867.jpg
Van_Gogh_-_Steg_über_einen_Graben.jpeg
Wikibooks misscover.svg
Doric_Chiton.svg
James_Madison_by_Gilbert_Stuart.jpg
Hans Gude - Tordenskyer over Chiemsee - Thunder Clouds over the Chiemsee - 1867.jpg
Coëtivy_Master_(Henri_de_Vulcop?)_(French,_active_about_1450_-_1485)_-_Philosophy_Instructing_Boethius_on_the_Role_of_God_-_Google_Art_Project.jpg
Spelterini_Pyramids.jpg
Wappers_belgian_revolution.jpg
Wappers_belgian_revolution_DYK.jpg
Igbo_people.jpg
Sir_Kenelm_Digby_by_Sir_Anthony_Van_Dyck.jpg
YES_HE_DID_..AND_THIS_IS_WHY.jpg
Flag of Croatia for discussion.svg
Lemoine Problem Solution.svg
GLPK solution of a clustering problem.svg
GLPK solution of a travelling salesman problem.svg
CPT-halting-problem.svg
Goat problem 2D.svg
KCL Example 1b.svg
TwoRaysLensAnswer.svg
guillaumin_moulins_en_hollandee_1904.jpg
Depiction of indirection in a tree based solution to the order-maintenance problem.svg
Voyager Golden Record Cover Explanation mk.svg
Problem-Solving-fr.svg
Network flow 8 vertices solution.svg
Network flow 9 vertices solution.svg
Lemoine's Problem Lemma.svg
Disk pack13b.svg
Synoptic Theory In en.svg
Synoptic Theory JSH en.svg
Synoptic Theory MS en.svg
Synoptic Theory Pt en.svg
Synoptic Theory Koester en.svg
William-Adolphe_Bouguereau_(1825-1905)_-_Ocean_Nymph_(L'océanide)(1904).jpg
Synoptic Theory 4SH en.svg
Synoptic Theory Lk-Mk en.svg
Synoptic Theory Mk-Mt en.svg
Synoptic Theory Mk-Q en.svg
Synoptic Theory Pt-Mt+Lk en.svg
Synoptic Theory Mt-Mk en.svg
Synoptic Theory Mk-Lk en.svg
Synoptic Theory Marcan Priority en.svg
sargent_vele_gonfie_also_known_as_en_wertheimer_1904.jpg
Koenigs-theorem-graph.svg
3SAT reduced too VC.svg
Synoptic Theory Mk-Q+Mt en.svg
Synoptic Theory Lk-Mt en.svg
Synoptic Theory Mt-Lk en.svg
Synoptic Theory Mk+Q-Mt+Papias en.svg
Elevateur manege nautilus demarche recherche solution statique sur graphe liaisons.svg
Srečko_Kosovel_1920s.jpg
The finding of Moses, by Lawrence Alma Tadema.jpg
Exemple methode rateau montage rdm.svg
3generałowie-rysunek1.svg
3generałowie-rysunek2.svg
Monet_-_Seerosen_-1904.jpg
Two_Little_Girls_with_Blue_Aprons.jpg
Book_cover_for_The_Condor,_by_Cooper_Ornithological_Club.svg
Circle in square Egyptian.svg
Kosztka_Csontváry_–_A_taorminai_görög_színház_romjai.PNG
South-West_Africa_Campaign_Commander_von_throta.jpg
Macedonia overview.svg
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