- Series: Letters: Sam Moskowitz Series Record # 66175
- Letters: Sam Moskowitz
- Letter (Amazing Stories, February 1938) (1938) [ES] by Sam Moskowitz
- Letter (Amazing Stories, January 1939): The Science Fiction Convention (1939) [ES] by Sam Moskowitz
- Letter (Thrilling Wonder Stories, February 1939): Five Star Issue (1939) [ES] by Sam Moskowitz
- Letter (Spaceways, February 1939) (1939) [ES] by Sam Moskowitz
- Letter (Weird Tales, April 1939): A Jumbo Edition (1939) [ES] by Sam Moskowitz
- Letter (Weird Tales, August 1939): Into Vigerous Maturity (1939) [ES] by Sam Moskowitz
- Letter (No Complaint) (1939) [ES] by Sam Moskowitz
- Letter (Spaceways, October 1939) (1939) [ES] by Sam Moskowitz
- Letter (The Alchemist, Summer 1940) (1940) [ES] by Sam Moskowitz
- Letter: The "Eternals" Immortal (Thrilling Wonder Stories, March 1940) (1940) [ES] by Sam Moskowitz [only as by Sam Muskowitz]
- Letter (Comet, December 1940) (1940) [ES] by Sam Moskowitz
- Letter (No More Classics) (1941) [ES] by Sam Moskowitz
- Letter (Planet Stories, Fall 1942) Hi Yo, Moskowitz, Away! (1942) [ES] by Sam Moskowitz
- Letter (Famous Fantastic Mysteries, February 1948): Moskowitz Answers Derleth (1948) [ES] by Sam Moskowitz
- Letter: Weird vs. Science-Fantasy (Fantasy Review, April-May 1948) (1948) [ES] by Sam Moskowitz
- Letter (Famous Fantastic Mysteries, January 1951): Mr. Moskowitz Explains (1951) [ES] by Sam Moskowitz
- Letter (Quandry, November 1951) (1951) [ES] by Sam Moskowitz
- Letter (Fantastic Story Magazine, Spring 1952) (1952) [ES] by Sam Moskowitz
- Letter (Analog, April 1964) (1964) [ES] by Sam Moskowitz
- Letter (Zenith Speculation, July 1966) (1966) [ES] by Sam Moskowitz
- Letter (Riverside Quarterly, March 1967) (1967) [ES] by Sam Moskowitz
- Letter (Speculation 21) (1969) [ES] by Sam Moskowitz
- Letter (SF Commentary 5) (1969) [ES] by Sam Moskowitz
- Letter (Science Fiction Review, February 1970) (1970) [ES] by Sam Moskowitz
- Letter (Riverside Quarterly, June 1970) (1970) [ES] by Sam Moskowitz
- Letter (SF Commentary 14) (1970) [ES] by Sam Moskowitz
- Letter (Amazing Stories, May 1971) (1971) [ES] by Sam Moskowitz
- Letter (OAK Leaves, V1n10) (1972) [ES] by Sam Moskowitz
- Letter (SF Commentary, 35/36/37) (1973) [ES] by Sam Moskowitz
- Letter (Amazing Stories, October 1977) (1977) [ES] by Sam Moskowitz
- Letter (Emperor of Dreams: A Clark Ashton Smith Bibliography) (1978) [ES] by Sam Moskowitz
- Letter (Analog, May 1978) (1978) [ES] by Sam Moskowitz
- Letter (Science Fiction Review #30) (1979) [ES] by Sam Moskowitz
- Letter (Science Fiction Review #31) (1979) [ES] by Sam Moskowitz
- Letter (SF Commentary 58) (1980) [ES] by Sam Moskowitz
- Letter (F&SF, March 1980) (1980) [ES] by Sam Moskowitz
- Letter (Asimov's, May 1980) (1980) [ES] by Sam Moskowitz
- Letter (Weird Tales #1) (1980) [ES] by Sam Moskowitz
- Letter (Locus #280) (1984) [ES] by Sam Moskowitz
- Letter (Analog, March 1985) (1985) [ES] by Sam Moskowitz
- Letter (Fantasy Review, May 1986) (1986) [ES] by Sam Moskowitz [only as by Sam Moscowitz]
- Letter (Locus #327) (1988) [ES] by Sam Moskowitz
- Letter (NYRSF, October 1988) (1988) [ES] by Sam Moskowitz
- Letter: Goldsmith's Golem (1989) [ES] by Sam Moskowitz
- Letter (NYRSF, November 1989) (1989) [ES] by Sam Moskowitz
- Letter (Tekeli-li!, Winter/Spring 1992) (1992) [ES] by Sam Moskowitz
- Letter (Locus #385) (1993) [ES] by Sam Moskowitz
- Letter (Locus #393) (1993) [ES] by Sam Moskowitz