The Ultimate Threshold

Ginsburg "has edited and translated the stories for three collections of Soviet sf [listed]" per SFE3; this one is the second-published. {{Tr|Mirra Ginsburg}}

• Stated first edition. (No number line). The WorldCat entry below gives the date as "[1970]", which means they've confirmed it as being published in 1970. However, the LCCN number is "79-...", which implies a publication date of 1979 or 1980, even though the LCCN record below also gives the date as "[1970]". The U.S. Copyright Office, which has all records from 1978 forward available online, does not include a record for this book. Thus while the LCCN number seems to imply a later publication date, the rest of the evidence says that this book was published in 1970, and we list it that way.