Sam Merwin's Knife in My Back was first published in 1945 by Mystery House. The Window With the Sleeping Nude is a PBO.
The Harlequin edition of Knife in My Back is not abridged - at least to the extent the Quinn edition is. It may be abridged from the original.
Handi-Book Mystery 44 - 1945
Handi-Book Mystery 44 back
Harlequin 70 - August 1950
Harlequin 70 back
Handi-Book Mystery 118 - 1950
Handi-Book Mystery 118 back
Harlequin 106 - April 1951
Harlequin 106 back