Two Complete Science-Adventure Books original Spring 1951 vintage pulp magazine

Two Complete Science-Adventure Books original Spring 1951 vintage pulp magazine
Spring 1951. Vol. 1, No. 2. Cover by Allen Anderson. Science Fiction by Edmond Hamilton "The Star Kings" and Arthur C. Clarke "Seeker of the Sphinx". Illustrations by Orban. 6 7/8" x 10"; black and white; 148 newsprint pages. Cover price $0.25
"This autograph is certified by a 20 year plus member of IADA (International Autograph Dealers Association) , UACC (Universal Autograph Collectors Club), IACC - International Autograph Collector Club), Manuscript Society, SAG (Screen Actors Guild), Southern California Motion Picture Council, APS (American Philatelic Society), ASCC (American Society Of Check Collectors), AFDCS (American First Day Cover Society), Hollywood Heritage Museum, and the Golden State Boxing Association. Additionally a member of the British Autograph Club and German Autograph Collectors Club. The COA issuer has the following credentials: UACC - Autograph Appraisal Course. UACC- Autograph Authentication Course. US Army CID Handwriting Program