[DCRM-L] odd index signatures

[Daniel Axmacher]

Hi all,

I've run into another book with some confusing signatures and I'm hoping
the listserv might be able to help.

In n the 10th volume of Desiderii Erasmi Roterodami Opera omnia, printed by
Pieter Van der Aa in Leiden in 1706, the index is signed on every page as
follows: a1-a21, b1-b6, c1-c30, and d1-d7.
Volumes 9 and 10 in the Athenaeum's set are bound together, but otherwise
seem to be in typical folio format, paginated and signed continuously in
gatherings of 4 up until the index. The final leaf preceding the index is
6B1. I think it might be a singleton, but I've had a difficult time
puzzling out the actual structure from the sewing and watermarks. I'm not
really sure what to make of the odd signatures, or how to note them.

For reference, it looks like there's a republished facsimile copy up on
HathiTrust that replicates the signatures.
https://hdl.handle.net/2027/pst.000046018779?urlappend=%3Bseq=321%3Bownerid=13510798902567536-331

Does anyone have any insight into what's going on with these signatures or
advice on how to proceed?

Thanks in advance,
Dan Axmacher
-- 
Daniel P. Axmacher
[he/him/his]
Rare Materials Catalog Librarian
Boston Athenæum
10½ Beacon Street
Boston, MA 02108
617-227-0270 ext. 245 <%28617%29%20227-0270>
www.bostonathenaeum.org
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