I found it.<br />the no. 11 november 1998 - page 440-445 - of spaceflight magazine has a long article on Corona (KH-4A).<br />Unfortunately it has not the exact dimensions of the SRV Satellite Recovery Vehicle (that was the name of the reentry vehicles). <br /><br />But give me the diameter of the upper stage of the TAT Agena D launcher and I will be able to give you a fairly accurate estimation of the capsule´s dimensions, since there is a plan view of the vehicle there.<br /><br />In fact there were 2 SRVs in each TAT Agena D vehicle.<br /><br />And I suggest you to look for<br />"Eye in the sky: the history of the corona spy satellites", Dwayne A. day, Smithsonian Inst. Press, page. 74-77;<br />Robert Perry<br />"A history of Satellite reconaissance Vol. 1 - CORONA"<br />1-oct-73 National reconaissance Office, CORONA/ARGON/LANYARD, Files 2/A/0080, p. 148<br /><br />Kevin C. Ruffner, " CORONA: America´s first satellite program" CIA History Staff, Center for the Study of Intelligence, May 1995, p. 33<br />