This is an excellent omnibus collection. Thank you for this.
I might also add that these two novels listed below were previously made available by me, and are in this omnibus collection:
1) The Murder Monster
https://www.mobileread.com/forums/showthread.php?t=22576
2) The Manchu Skull
https://www.mobileread.com/forums/showthread.php?t=11079
Again, this is an excellent collection of old pulp novels.
Don