Fantastic Adventures Yearbook 1970, [No. 1]

From Author Wars - https://authorwars.com/publications/fantastic-adventures-yearbook-1970-no-1-302009.html

Overview:

Title: Fantastic Adventures Yearbook 1970, [No. 1]
Author: uncredited
Year: 1970
Publisher: Ultimate Publishing Co., Inc.
Price: $0.60
Pages: 128
Binding: digest
Type: MAGAZINE
Title Reference: The Empress of Mars
Notes: First and only issue, unnumbered and dated 1970 (issued in the summer of 1970 according to Tymn & Ashley's magazine reference.)
Anonymously edited by Sol Cohen.
Info from the NESFA Index to the SF Magazines, 1966-1970.
Miller/Contento doesn't list the "Life on Venus" feature by Burt.
Month of publication estimated.