Are You a Rare Blood?

From Author Wars - https://authorwars.com/books/are-you-a-rare-blood-1456879.html

Overview:

Title: Are You a Rare Blood?
Author: Robert A. Heinlein
Year: 1976
Type: Essays

Editions/Publications:

Unknown. The Nonfiction of Robert Heinlein: Volume II (Unknown, Robert A. Heinlein, The Virginia Edition, ISBN-10: 9781897350430, v+463 pages, Hardcover, Non-fiction)