[DCRM-L] Collation conundrum

[Lenore Rouse]

Hoping the collective wisdom can suggest the best way to formulate an 
early 18th-century continental pamphlet of 10 leaves. It's a  4to in 8s 
with an extra fold wrapped around the regular 8 leaf gathering thus:
[1 blank leaf preceding t.p.],  normal 8-leaf gathering A,  [single leaf 
comprising p. 17 and blank [18]]

The simplest formula would seem to be:
[pi]1 A^8  [chi]1

with a note explaining that pi and chi are conjugate. This should be 
simple, a common occurrence for pamphlets, but I find no direction in 
Bowers and wonder if something more complicated is in order? Because 
there is another edition of this title, virtually identical save for 
signings, it seems necessary to record collation in order to 
disambiguate the 2 (or more) extant versions.

Thanks for any suggestions.

Lenore

-- 
Lenore Rouse, Curator
Rare Books and Special Collections
Catholic University of America
Room 214, Mullen Library
620 Michigan Avenue N.E.
Washington, DC 20064

Phone: (202) 319-5090
Email:rouse at cua.edu
RBSC Blog:http://ascendonica.blogspot.com/