Oversized Books -- See Oversize books Here are entered works on books too large to be shelved in normal shelf sequence. Actual specimens of such books are entered under Oversize books--Specimens, a form heading assigned without geographic subdivision.
Overtures : Tchaikovsky discovers America / writer, Douglas Cowling.
Overtures Orchestra -- See Overtures Here are entered overtures for orchestra. Overtures for other mediums of performance are entered under this heading followed by the medium, e.g. Overtures (Chamber orchestra). Works about the overture are entered under the heading Overture.