# This is a map from the shorthands used in USNO plate table files, last
# column, to the survey numbers used in the USNO-B (or rather, the chars
# I make from them)
A so  # POSS-I O (Blue)
B se  # POSS-I E (Red)
C sj  # POSS-II J
D sf  # POSS-II F
E sb  # SERC-J or SERC-EJ
F sr  # ESO-R or SERC-ER
G sr  # AAO-R
H sn  # POSS-II N
I     # SERC-I
J uj  # POSS-II N as part of SERC-I

A Sso         # POSS-I  103a-O  350-500 -30..+90 936 1949-1965
B se, Sse     # POSS-I  103a-E  620-670 -30..+90 936 1949-1965
C sb          # POSS-II IIIa-J  385-540 +00..+87 897 1985-2000
D sf          # POSS-II IIIa-F  610-690 +00..+87 897 1985-1999
E sb          # SERC-J  IIIa-J  385-540 -90..-05 606 1978-1990
F sf          #  ESO-R   IIIa-F  630-690 -90..-05 624 1974-1994
G sf          #  AAO-R   IIIa-F  590-690 -90..-20 606 1985-1998
H             #  POSS-II IV-N    730-900 +05..+87 800 1989-2000
I             #  SERC-I  IV-N    715-900 -90..+00 892 1978-2002
J             #  SERC-I* IV-N    715-900 +05..+20  25 1981-2002