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    Re: HO Series
    From: Brad Morris
    Date: 2019 Dec 28, 16:21 -0500
    Or perhaps, they chose numbers based upon availability, since the assignments have gaps


    On Sat, Dec 28, 2019, 1:48 PM Frank Reed <NoReply_FrankReed@fer3.com> wrote:

    I believe that's the same link I provided two days ago. It's a Hydrographic Office index from 1957. Can anyone locate a more recent version of this index? Maybe one that includes H.O. 229? Perhaps an index from just before they dropped the "H.O." moniker? 

    And while we're here, does anyone know how 229 received a number lower than 249? There are clearly gaps in the sequence, and as pure speculation, I would imagine that numbers were assigned to proposed publications at an early stage in the process for each. Many projects were cancelled, and at some point the agency decided to re-use numbers from projects that died an early death. Perhaps someone thought it would be nicely symmetrical if the new surface tables had a number similar to the air navigation tables (which were first published at least 20 years earlier): 229 versus 249. This is pure speculation on my part. If anyone has an alternative speculation, let's hear it. If you have heard a better story that might be history, please, if possible, tell us where you heard it. Some histories are just speculations without a disclaimer. :)

    Frank Reed

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