A number of codes have been used to designate various aspects of each
map's bibliographic description. An explanatory list of these codes and
other descriptive conventions is provided below.
c circa date -- no date on the map. Date is derived from information
on the map.
a assigned by staff, based on information available in addition
to the map
(no code) date taken directly from the map
Publisher
also includes the agency responsible for the creation or production
of the map
Scale
st. statute miles
Format
b&w black and white
blueline blue on white
blueprint white on blue
brown line brown on white
col color
elp engraved/lithographed/printed
ms manuscript
neg negative
other reproduction process not listed here
photocopy
ph-p positive photostat, black on white
photo photograph
photostat white on black
purple line purple on a light background
slide 35 mm slide
trans. photographic positive transparency
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Type
ag agricultural map
bird birdseye view
gen general map
geo geologic map
hwy highway map
nau nautical chart
o&g oil and gas map
out outline map
own ownership map
plat plat
relf relief map
rr railroad map
stat statistical map
str street map
sur survey map
topo topographic map
tran transportation map (focus not on railroads or general highways)
wea weather & weather related info
Record Group or Series
The record group number assigned to state agencies is sometimes used
in this field. For instance the number 017.8 refers to maps in Texas
Planning Board records, series 8.
For manuscript collections, the series number or title is given following
the title of the collection, e.g., James H. Holdeman Papers, series
7
If the records or papers are unprocessed, a series designation is not
given.
AC Number
An accesion number is assigned when the map is received and is used
as a control number.
Language
e English
s Spanish
g German
(other languages follow this format)
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