You did not check any search criteria, so I am displaying ALL the covers:
Number of cover matching : 10683 Page 61 /891
more info
ref
space event
date
USA 273 C
GEMINI 8 (GTA 8) - TITAN 2 GLV - ARMSTRONG & SCOTT - DOCKING WITH GATV 8 03/17/1966 33,54
USA 273 G
GEMINI 8 (GTA 8) - TITAN 2 GLV - ARMSTRONG & SCOTT - DOCKING WITH GATV 8 03/17/1966 33,54
USA 273 H
GEMINI 8 (GTA 8) - TITAN 2 GLV - ARMSTRONG & SCOTT - DOCKING WITH GATV 8 03/17/1966 33,54
USA 273 E
GEMINI 8 (GTA 8) - TITAN 2 GLV - ARMSTRONG & SCOTT - DOCKING WITH GATV 8 03/17/1966 60,-
ba 88
ZENIT 4-16 - KOSMOS 113 - VOSKHOD 03/21/1966 60,-
USA 274
OV1 04 & OV1 05 (BORE) (SATELLITES) - ATLAS D 03/30/1966 8,-
ba 89
LUNIK 10 - LUNA 10 / YE-6S 2 - LUNAR PROGRAM - MOLNIYA-M 03/31/1966 250,-
ba 90
LUNIK 10 - LUNA 10 / YE-6S 2 - LUNAR PROGRAM - MOLNIYA-M 04/03/1966 208,-
ba 91
ZENIT 4-17 - KOSMOS 114 - VOSKHOD 04/06/1966 60,-
USA 275
OAO 1 (ORBITING ASTRONOMICAL OBSERVATORY) - ATLAS SLV3B 04/08/1966 15,-
mo 34324 Z
VOSTOK 1 (1st manned spacecraft) - YURI GAGARIN - 1ST MAN IN SPACE - VOSTOK K 04/12/1966 1 000,-
ba 92
VOSTOK 1 - YURI GAGARIN - 5TH ANNIVERSARY - USSR COSMONAUTIC DAY 04/12/1966 50,-