I had this book in the fall of 1978. Scholarly book on Babylonian and Assyrian myths. Dover-type binding (probably not Dover book, at least it’s not on their website). Perhaps 200 pages if that, not long, 5 1/2 x 8 1/2. Bright blue cover with line drawing on right-hand side, possibly a picture of Marduk? It was not the one by Donald Mackenzie or E.A. Wallis Budge, but it was that type of thing. I thought it might be Lewis Spence, but have searched for an edition with that cover and found nothing. I had just started to read it, lent it to a friend and never got it back.