Come to think - i think that story was published before
Asimov's began publication; i feel like i read it in a collection years ago - possibly the SF Book Club's loss-leader/enrollment premium two-volume
Treasury of Great Science Fiction (
five copies available on Amazon), which dates back to the Sixties, i think. Hmmm...
Ah ha - 1960. Edited by Anthony Boucher
Ah A contents listing - i do believe it's "Letters from Laura" by Mildred Clingerman, originally published 1954 in
The Magazine of Fantasy & Science Fiction, in Vol 2 of the SFBC treasury.
Full contents for both volumes:
Vol 1:
5 • Before the Curtain . . . • (1959) • essay by Anthony Boucher
9 • Re-Birth • (1955) • novel by John Wyndham (variant of The Chrysalids)*
136 • The Shape of Things That Came • (1951) • shortstory by Richard Deming
141 • Pillar of Fire • (1948) • novelette by Ray Bradbury
170 • Waldo • (1942) • novella by Robert A. Heinlein
245 • The Father-Thing • (1954) • shortstory by Philip K. Dick
255 • The Children's Hour • (1944) • novelette by Henry Kuttner and C. L. Moore
288 • Gomez • (1954) • novelette by C. M. Kornbluth
308 • The [Widget], the [Wadget], and Boff • (1955) • novella by Theodore Sturgeon
370 • Sandra • (1957) • shortstory by George P. Elliott
380 • Beyond Space and Time • (1938) • novelette by Joel Townsley Rogers
400 • The Martian Crown Jewels • (1958) • shortstory by Poul Anderson
413 • The Weapon Shops of Isher • [Weapon Shops of Isher • 2] • (1951) • novel by A. E. van Vogt
Vol 2:
7 • Brain Wave • (1954) • novel by Poul Anderson
120 • Bullard Reflects • [Bullard] • (1941) • shortstory by Malcolm Jameson
131 • The Lost Years (Excerpt) • (1951) • shortfiction by Oscar Lewis
166 • Dead Center • (1954) • novelette by Judith Merril
187 • Lost Art • [Venus Equilateral] • (1943) • novelette by George O. Smith
207 • The Other Side of the Sky • [The Other Side of the Sky] • (1957) • shortfiction by Arthur C. Clarke
222 • The Man Who Sold the Moon • [D. D. Harriman] • (1950) • novella by Robert A. Heinlein
293 • Magic City • [Meg • 3] • (1941) • novelette by Nelson S. Bond
322 • The Morning of the Day They Did It • (1950) • shortstory by E. B. White
334 • Piggy Bank • (1942) • novelette by Henry Kuttner and C. L. Moore [as by Henry Kuttner ]
356 • Letters from Laura • (1954) • shortstory by Mildred Clingerman
361 • The Stars My Destination • (1956) • novel by Alfred Bester
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* Incidentally, this is the Wyndham novel from which Kantner lifted several important lines for "Crown of Creation"...