Archives hold collections of personal and institutional papers. Descriptions of the collections are often available online in documents called Finding Aids. These outline the contents of the collection, but don't necessarily include digital versions of the contents. These databases will help you find if and where personal and institutional papers are held.
Many archives include entries for their Finding Aids in Worldcat (limit your search to Archival Materials). The University Library subscribes to many databases described as archives, which will put you in touch with primary sources. These resources generally include a single publication (e.g., Vogue Magazine) or have a particular subject focus (e.g., Archive of Americana). The following list is just a sampling. To find more go to Search Tools and enter Archive as your search.
Listed here are specialized libraries, architectural collections, and online resources related to your projects.
Foreign Architect Hong Kong Contemporary Architecture Guide (travel focus, but puts one in touch with sources)
Online Archive of California (includes university and museum archives)
New York City
World Trade Center (historic buildings in Lower Manhattan)
Directories & Guides
e-architect postings about world buildings, organized by city (online resource for contemporary architecture)
e-architect postings about world buildings, organized by country
Archives Hub, a directory of over 300 archives in the U.K.