Journal of the British Interplanetary Society: May 1981

 https://welib.org/md5/0020262a0c48bfa09ef1082c41bb3edb

Club Management; January 1981

 https://welib.org/md5/896b813a94f0eced657ea420ab358f6c

Booklist: January 1,1981

 https://welib.org/md5/29ff8dc8e62428898c31951f65d7b54b

Club Management: December 1980

 https://welib.org/md5/720104b7dfa62ed00ef227e99df836db

Kosmos 207

  1968-021A

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Zenit-4 No. 39 was launched in Mar 1968 and flew an 8 day mission at 65.6 degrees from Plesetsk.

Kosmos-207
Date	Time	Event	Orbit
1968 Mar 16	1230:00	Launch by 11A57	PL
	1234	Blok-I burn
	1239	Blok-I sep	89.7 201 x 321 x 65.6
	1645		89.92 202 x 338 x 65.7
1968 Mar 24	0832		89.57 199 x 307 x 65.6
1968 Mar 24	0735?	Deorbit
	0755?	Landed after 7.79d

Kosmos 419

  1971-042A

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The first of three Mars-71 probes, M-71S (3MS) No. 170 was launched on 1971 May 10. M-71S No. 170 was a light version of the M-71 series. It was intended to enter Mars orbit. The Blok-D first burn successfully placed the probe in parking orbit, but the engine failed to ignite for the second burn because of a software error. The failed probe was designated Kosmos-419 and it reentered after two days.

Kosmos-419
Date	Time	Event	Orbit
1971 May 10	1658:42	Launch by Proton-K	KB
	1700	Stage 2 burn
	1703	Stage 3 burn
	1708	Stage 3 sep
	1712?	Blok-D burn
	1714?	Blok-D cutoff
	1825?	Blok-D burn 2 failed to ignite
1971 May 11	0851		87.52 141 x 162 x 51.5
1971 May 11	1430		87.47 145 x 159 x 51.53
1971 May 12	0936		87.25 137 x 139 x 51.5
1971 May 12	2009?	Reentered