With no explanation, label each line with "building-library", "location-GPE", "O", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart" or "building-airport" preceded by ":".
Much
of
his
personal
papers
,
including
correspondence
with
figures
of
historical
interest
and
various
manuscripts
,
are
now
kept
by
Harvard
's
Houghton
Library
in
Cambridge
,
Massachusetts
.
Much:O
of:O
his:O
personal:O
papers:O
,:O
including:O
correspondence:O
with:O
figures:O
of:O
historical:O
interest:O
and:O
various:O
manuscripts:O
,:O
are:O
now:O
kept:O
by:O
Harvard:building-library
's:building-library
Houghton:building-library
Library:building-library
in:O
Cambridge:location-GPE
,:O
Massachusetts:location-GPE
.:O