Illegal stamps

Illegal stamps are ones which were issued without the permission of the postal authorities. They could not be used to send letters.

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newton31 Chad 1999	durer9 Chad 1999	russell3 Angola 2001	leonardo33 Mali 2005
romer2 Mali 2006	hubble3 Djibouti 2006	hawking2 Djibouti 2006	hooke3 Djibouti 2006
huygens4 Djibouti 2006	leonardo18 Djibouti 2006	newton54 Djibouti 2006	newton53 Mali 2006
gemma_frisius1 Mali 2006	halley40 Mali 2006	huygens5 Mali 2006	cassini2 Mali 2006
flamsteed1 Mali 2006	aristotle16 Malawi 2008	babbage3 Malawi 2008	bacon1 Malawi 2008
newton56 Malawi 2008	zhang_heng2 Malawi 2008	arch6 Malawi 2008	al-haytham4 Malawi 2008
newton58 Mali 2009	newton59 Rwanda 2009	leonardo3 Rwanda 2009	huygens6 Rwanda 2009
arago4 Djibouti 2010	adams Djibouti 2010	brahe11 Djibouti 2010	maxwell2 Mali 2010
kepler51 Mali 2010	newton87 Malawi 2011	kepler55 Malawi 2011	newton70 Mali 2011
huygens12 Mali 2011	arch10 Mali 2011	hertz_heinrich11 Mali 2011	ohm3 Mali 2011
kepler52 Mali 2011	zhang_heng3 Mali 2011	zu_chongzhi3 Mali 2011	newton82 Mali 2012
newton82a Mali 2012	kepler57 Chad 2015	group1 Chad 2015	group2 Chad 2015
shen_kuo1 Chad 2015