A search of the U.S. Copyright records showed no records for "The Bowen Escapades," although I believe that the manuscript was first written in or about the year 1964, a date too early to have been included in the government database. There are no recognized copyright marks on the copy I have which is, I believe, a facsimile of the original typewritten manuscript by Gertie Bowen kept in the Victor Valley Museum.
I do not believe that the manuscript was ever registered for copyright. Mrs. Bowen just wanted people to be able to read about her family life on the Bowen Ranch.