What has the author Howard Riley Raper written?

There does not appear to be a published author named "Howard Riley Raper." It is possible that the name is misspelled, or that the author goes by a different name professionally.

To help me find the correct author, could you please provide:

* Any other possible spellings of the name

* Any other information about the author, like their profession or the genre they write in

* The title of any books they have written

With more information, I can assist you in finding the correct author and their works.