A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
From: David C
Date: 2019 Dec 26, 15:00 -0800
One way you can explore the list is by searching for volumes at hathitrust.org. Enter a number, e.g. 235, in the title search field, and "Hydrographic Office" in the full text etc. search field. You'll get some false positives, but it seems manageable. I had never heard of H.O. 235 before. But now I know (see below)...
Thanks. I have remembered that Bowditch 1958 has a list of Hydrographic Office publications but it is not complete.
There were presumanly other departments of the US government that issued relevant documents. For example I have a copy of Special Publication No. 197 "Practical Air Navigation" (1938) published by the US Dept of Commerce Coast and Geodetic Survey. Although it has information on CN I find the radio range (A - N) charts more interesting.