Robert A. Heinlein at San Diego Comic-Con in 1977.

Photo by Jackie Estrada

- See more at: http://www.comic-con.org/wca/blood-drive#sthash.Q7wmU9tZ.dpuf

Robert A. Heinlein at San Diego Comic-Con in 1977.

Photo by Jackie Estrada

- See more at: http://www.comic-con.org/wca/blood-drive#sthash.Q7wmU9tZ.dpuf