1.Buddhist Stupa at Sanchi in Madhya Pradesh
Bhajish Bharathan, CC BY-SA 4.0 <https://creativecommons.org/licenses/by-sa/4.0>, via Wikimedia Commons
https://commons.wikimedia.org/wiki/File:Buddhist_Stupa_at_Sanchi_in_Madhya_Pradesh.jpg
2.Archaeological excavations of the Temple of Vāsudeva, Besnagar
Ministry of Culture, GODL-India <https://data.gov.in/sites/default/files/Gazette_Notification_OGDL.pdf>, via Wikimedia Commons
https://commons.wikimedia.org/wiki/File:Besnagar_lower_levels_BSN_3_next_to_the_Heliodorus_pillar.jpg
3.Heliodorus pillar
British Library 1915, Public domain, via Wikimedia Commons
https://commons.wikimedia.org/wiki/File:Heliodorus_pillar_1913-15_excavation.jpg
4.Heliodorus pillar with elevation
Public Domain file: Rawlinson, H. G. (Hugh George), 1880-1957, published in 1912.Photograph: User:Dilipkumarftii1977, CC BY-SA 4.0 <https://creativecommons.org/licenses/by-sa/4.0>, via Wikimedia Commons
https://commons.wikimedia.org/wiki/File:Heliodorus_pillar_with_elevation.jpg
5.Coin of Antialcidas
CC BY-SA 3.0, https://commons.wikimedia.org/w/index.php?curid=174829
https://upload.wikimedia.org/wikipedia/commons/c/c5/Coin_of_Antialcidas.jpg
6.Coin of the King Agathocles, Bactria
Classical Numismatic Group, Inc. http://www.cngcoins.com, Public domain, via Wikimedia Commons
https://commons.wikimedia.org/wiki/File:Coin_of_the_Bactrian_King_Agathokles.jpg
7.Alexander the Great
Berthold Werner, Public domain, via Wikimedia Commons
https://commons.wikimedia.org/wiki/File:Alexander_and_Bucephalus_-_Battle_of_Issus_mosaic_-_Museo_Archeologico_Nazionale_-_Naples_BW.jpg
8.Alexander’s Empire, 323 BCE
Thomas Lessman (Contact!), CC BY-SA 3.0 <https://creativecommons.org/licenses/by-sa/3.0>, via Wikimedia Commons
https://commons.wikimedia.org/wiki/File:Alexander-Empire_323bc.jpg
9.Hypaspist
Peltast at English Wikipedia aka Johnny Shumate. For more illustrations email shumate_j@bellsouth.net, Public domain, via Wikimedia Commons
https://commons.wikimedia.org/wiki/File:Hypaspist.jpg
10.Seleucid Empire, 281 BCE
Talessman, CC BY-SA 3.0 <https://creativecommons.org/licenses/by-sa/3.0>, via Wikimedia Commons
https://commons.wikimedia.org/wiki/File:Rome-Seleucia-Parthia_200bc.jpg
11.Seleucus I Nicator
Allan Gluck, CC BY 4.0 <https://creativecommons.org/licenses/by/4.0>, via Wikimedia Commons
https://commons.wikimedia.org/wiki/File:Seleukos_I_Nikator_Bronze_Roman_100BCE-100CE_Museo_Archeologico_Nazionale_Naples_AN_5590_1.jpg
12.Seleukos I Nikator
Classical Numismatic Group, Inc. http://www.cngcoins.com, CC BY-SA 2.5 <https://creativecommons.org/licenses/by-sa/2.5>, via Wikimedia Commons
https://commons.wikimedia.org/wiki/File:Seleukos_I_Nikator,_tetradrachm,_312-281_BC,_HGC_9-20.jpg
13.Chandragupta Maurya Empire 303 BCE
Avantiputra7, CC BY-SA 4.0 <https://creativecommons.org/licenses/by-sa/4.0>, via Wikimedia Commons
https://commons.wikimedia.org/wiki/File:Chandragupta_Maurya_Empire_303_BCE_1.png
14.Chandragupta Maurya
GODL-India <https://data.gov.in/sites/default/files/Gazette_Notification_OGDL.pdf>, via Wikimedia Commons
https://commons.wikimedia.org/wiki/File:Chandragupta_Maurya_Stamp.jpg
15.A Greco-Bactrian ruler
ALFGRN, CC BY-SA 2.0 <https://creativecommons.org/licenses/by-sa/2.0>, via Wikimedia Commons
https://commons.wikimedia.org/wiki/File:Head_of_a_Greco-Bactrian_ruler,_Temple_of_the_Oxus,_Takht-i-Sangin,_3rd-2nd_century_BCE.jpg
16.Temple of the Gadde
Yale University Art Gallery, CC0, via Wikimedia Commons
https://commons.wikimedia.org/wiki/File:Cult_relief_of_the_Gad_(Fortune)_of_Dura,_from_the_Temple_of_the_Gadde.jpg
17.Ashoka, Sanchi Stupa
Photo Dharma from Sadao, Thailand, CC BY 2.0 <https://creativecommons.org/licenses/by/2.0>, via Wikimedia Commons
https://commons.wikimedia.org/wiki/File:Ashoka%27s_visit_to_the_Ramagrama_stupa_Sanchi_Stupa_1_Southern_gateway.jpg
18.Greco – Bactrian Philosopher
Public domain, via Wikimedia Commons
https://commons.wikimedia.org/wiki/File:PhilosopherBust.jpg
19.Chakhil-i-Ghoundi Stupa, Afghanistan
Originally uploaded by PHG., Public domain, via Wikimedia Commons
https://commons.wikimedia.org/wiki/File:Indo-GreekBanquet.JPG
20.Shunga empire
Map created from DEMIS Mapserver, which are public domain. Koba-chan.Reference: [1], CC BY-SA 3.0 <http://creativecommons.org/licenses/by-sa/3.0/>, via Wikimedia Commons
https://commons.wikimedia.org/wiki/File:Map_of_the_Shungas.png
21.Bharhut Yavana
User:G41rn8, CC BY-SA 4.0 <https://creativecommons.org/licenses/by-sa/4.0>, via Wikimedia Commons
https://commons.wikimedia.org/wiki/File:Bharhut_Yavana.jpg
22.Taxila
Marify, CC BY-SA 3.0 <https://creativecommons.org/licenses/by-sa/3.0>, via Wikimedia Commons
https://commons.wikimedia.org/wiki/File:Let%27s_see_Taxila_053.jpg
23.Bharhut Stupa
Biswarup Ganguly, CC BY 3.0 <https://creativecommons.org/licenses/by/3.0>, via Wikimedia Commons
https://commons.wikimedia.org/wiki/File:East_Gateway_and_Railings_Bharhut_Stupa.jpg
24.Vasudeva Temple next to Heliodorus Pillar
Ministry of Culture, GODL-India <https://data.gov.in/sites/default/files/Gazette_Notification_OGDL.pdf>, via Wikimedia Commons
https://commons.wikimedia.org/wiki/File:Elliptic_plan_of_the_Temple_next_to_the_Heliodorus_pillar,_Besnagar.jpg