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    Re: HO Series
    From: Frank Reed
    Date: 2019 Dec 26, 14:36 -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)...

    I found an index from 1957 from H.O. itself: https://babel.hathitrust.org/cgi/pt?id=mdp.39015092889743&view=1up&seq=3

    Frank Reed

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