Each is 8.5x11.75" with an average page count of 98. 1930 issues include Vol. 2 #1 June, Vol. 2 #2 July, Vol. 2 #3 Aug., Vol. 2 #5 Oct. Dec. 1931 issue is Vol. 3 #7. 1932 issues include Vol. 3 #8 Jan., Vol. 3 #9 Feb., Vol. 3 #10 March (one plus duplicate), Vol. 3 #11 April (one plus duplicate),Vol. 3 #12 May, and Vol. 4 #2 July. 1933 issues include Vol. 4 #8 January, Vol. 5 #1 June, and Vol. 5 #2 Aug. All cover art is by Frank Paul except for Aug. 1930 which is by Jim Vanny showing two explorers being attacked by robot. Writers include Clark Ashton Smith, Edmond Hamilton, and D.D. Sharp. July and Aug. 1930 issues each have nice full page ad offering autographed copy of "The Planet Of Peril" by Otis Adelbert Kline for $2.00 with text noting "This Edition Is Very Limited." April 1932 issue has nice full color ad for "Science And Mechanics" magazine. Covers have scattered lt. dust soil with a few moisture marks here and there. Aug. 1930 issue has 1" strips of cloth tape in three places around spine and interior has five ink signatures. July 1932 issue has a coupon clipped. June and Aug. 1933 issues each have heavy cover dust soil. Group is overall VG/Fine. Wonderful illustrations throughout.