Dear Silvana,



I’m the map cataloger at UCLA and I see this sort of thing quite often, when one map is used as a sort of “base map” for an updated version.  I’ve seen many cases where I have one blueline print map from some city agency, and I have another that is almost a duplicate except for some added or revised information.



I recently asked two rare-map catalogers about how to deal with this, and it boils down to cataloger’s judgment about whether to consider them the same map or not.  Can you tell whether the “later” one  (with more lot information) was printed that way, or whether it was annotated by hand?  I think if it was actually printed, then it is a revised version of the first one (on the larger sheet).  It also seems to have been distributed in a different way, since it was folded to a smaller size.  My tendency is to treat these as 2 separate maps, especially since developers printed and distributed lots of updated maps for their subdivisions to attract new buyers.



For the physical description, I always indicate the original condition of the sheet, e.g.:  300  $c 48 x 65 cm, folded to 21 x 10 cm,  if it seems to have been issued that way.  Sometimes it’s hard to tell whether it was originally a flat sheet that somebody folded after they obtained it, but if the folds are precise and the folded size is small, it was probably issued that way.



I differentiate between “identical” maps by using different Cutter numbers for the author cutter; we add LC call numbers to our sheet maps, and that is the convention that LC uses.  (For example, a U.S. agency might get .U5, .U51, U52 etc. for different versions of the same map.)  But I don’t think it would be “wrong” to add a work letter to one of the dates.



To differentiate between the two maps in the bibliographic  records, sometimes I make up an edition statement for one of them, since otherwise the bibliographic description is the same.  The OCLC duplicate detection algorithm (if OCLC is what you are using) might consider them duplicates without a difference in a fixed field, tag, or field.  You could say, for example, 250 [Updated ed.] or something like that.



I add lots of notes too, but the OCLC program doesn’t look at those.



Hope this helps!

Louise



Louise Ratliff

Social Sciences and Map Catalog Librarian

UCLA Library Cataloging & Metadata Center

11020 Kinross Ave.

Box 957230

Los Angeles, CA 90095-7230

(310)206-5853



From: Maps-L: Discussion Forum for Maps, Air Photo, Map Librarianship, GIS, etc. [mailto:[log in to unmask]] On Behalf Of Angela R Cope

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Subject: questions for map catalogers









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From: [log in to unmask]<mailto:[log in to unmask]> <[log in to unmask]<mailto:[log in to unmask]>>

Sent: Wednesday, October 1, 2014 12:38 PM

To: MAPS-L

Subject: questions for map catalogers



Hi there,

I normally work with rare books, but I occasionally catalog cartographic

materials as well.

I don't do them regularly, so it's like I have to relearn it every time

I start again :/

I have 2 cadastral maps in hand. They show the same exact area (same

neat line dimensions), with the same title, pub, date etc. but they're

are distinct differences between the 2. one copy is on a larger sheet

(map would be on the inside (or backside?) of a large originally folded

pamphlet). this copy also has a lot of text (on the "cover" side about

the construction company and the area being developed). The 2nd copy is

on a sheet a tiny bit larger than the neat line dimensions, looks

exactly the same, except there is no additional text. I don't know if

there's any text on the backside as it has been mounted on thicker

paper. Looks like it was folded too, but to much smaller dimensions, and

I don't know if it was issued that way. Also, the 2nd copy has been

updated to show more lots were sold (sold lots are highlighted in red),

so it was obviously issued later than than the 1st.



So question #1, does the second map get a new record or is it added as a

2nd copy w/differences detailed in local notes?



Question #2, do sheet maps get work letters attached to dates when more

than one version of the same maps is issued in (presumably) the same

year (like books do)?



Question #3, even though they were originally issued folded, they are

currently unfolded and encapsulated. So, if my understanding is correct,

you physically describe them in their present state in 300c. Should I

make a note describing original folded state and dimensions?



Thanks,

-Silvana

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