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The U.S. Library of Congress identifies "Pauline Clarke" as her maiden name; "Pauline Mosby" as the wife of John Singleton Mosby. It's catalog does not use Mosby, but other libraries do, that WorldCat record shows. -P64
... Pauline Mosby, the wife of John Singleton Mosby, is featured in his papers which are mainly from the 1860s, *not* 1960s. So there must be two Pauline Mosby whom WorldCat conflates in composing that webpage.
Back to square one, many library records (WorldCat participants) give name Pauline Mosby for books we attribute to Clarke. --P64 (talk) 20:43, 21 May 2013 (UTC)
User: Robina Fox suggests at Talk: The Twelve and the Genii that this is simply a WorldCat error in processing original(?) library catalog records that specify Pauline Clarke, which was the maiden name of the 19th-century Pauline Mosby. (Equivalently for our purposes, it could have happened during digitization of original records at participating libraries, if they used a confused reference ID at that stage.) --P64 (talk) 18:08, 22 May 2013 (UTC)
Clare, Helen 1921–" at WorldCat is linked to the "controlled identity" Pauline Clarke (good). Oddly to me it reports the role "librettist" for Clare; "illustrator" for Clarke. Presumably those values are derived from at least one library catalog record.
WorldCat reports audience level 0.17 for Clare; 0.18 for Mosby; 0.31 for Clarke (perhaps inclusive); 0.35 for Blair. The scale runs nominally from 0 to 1 and Anglo-Saxon Northumbria scores 0.81. The average score makes me doubt that she uses "Pauline Hunter Blair" exclusively when writing for adults. Evidently the low score is derived largely from 0.33 for Jacob's Ladder.
The dates we provide in the list of Works suggest to me that she has abandoned Helen Clare and Pauline Clarke regardless of the level of the work. --P64 (talk) 20:35, 21 May 2013 (UTC)