Some wonderful historical documents here:

A RSS feed for the Belize National Library Service and Information System (BNLSIS) newest items in dLOC is here. Some great reading in there.

Like this one:
A Trip to British Honduras : and to San Pedro, Republic of Honduras

And this one:
The Beginning of British Honduras, 1506-1765

And this one:
Geography of British Honduras, 1922

And this one:
William A. Schipp's Botanical Explorations in the Stann Creek and Toledo Districts, British Honduras (1929-1935)

Well heck i'll put a big list at the end of this.....

Here's a searchable interface:
http://ufdc.ufl.edu/inlsbze

here's another killer source:
Digital Library of the Caribbean

Here's the Belize Nat'l Library Service & Information Systems website:
http://www.nlsbze.bz/

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List of Recent Items in The Belize National Library Service and Information System