Official use only . . . 3.27-3.28

On-going bibliographies . . . 3.52-3.53

Open date . . . 2.13

Order of notes . . . 3.4-3.6

Order of subject headings . . . 4.1

Orientation . . . 3.23

Orientation compass . . . 3.23

Original version note . . . 8.1-8.7, E.6

Orthophotomaps . . . 1.9

Other physical details . . . 2.14

Outline and base maps . . . 1.9

Overseas acquisition number . . . 6.4, E.5

Overseas acquisitions card number . . . 6.4

Oversize . . . 1.22

Ozanne collection . . . 1.23

See also:

Index