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    Re: HO Series
    From: David C
    Date: 2019 Dec 26, 15:00 -0800

    Frank Wrote

    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.

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