Jack O'Connor was one of the most read outdoor writers of the mid-to-late twentieth century. He extolled the benefits of the .270 which led to its current popularity among many big game hunters in the U.S.
A book is a first edition if it is so stated on the copyright page, and, usually, if the year on the title page is the same as that for the copyright.
Examine the photos carefully as they are an integral part of the description.