Here's what I found doing a web search. Unfortunately, my reference materials are in the U.S.:
"The material upon which this novel is built appeared originally as
"Okie" and "Bindlestiff," copyright 1950 by Street and Smith Publications, Inc., in the U.S.A and Great Britain; "Sargasso of Lost Cities," copyright 1952 by Wings Publishing Co. Inc.; and "Earthman, Come Home," copyright 1953 by Street and Smith Publications, Inc., in the U.S.A. and Great Britain. (source: Avon S218 which is the 5th Avon printing of Earthman, Come Home)"
Source:
http://www.isfdb.org/wiki/index.php/Author:James_Blish
Don