There is a subject heading Building, Iron and Steel that yields some interesting results in Tripod. Or try searching Tripod for the type of structure or construction that you are interested in.
You could also browse the shelves to find books. These are some subject areas (identified by the letters/numbers on the spines of the books), that could be useful for your class projects:
NA = Architecture (likely in McCabe)
T = Technology (including general Engineering)
TA = Civil Engineering
TF = Railroad Engineering
TG = Bridge Engineering
TH = Building Construction
These books might be in Cornell's REFERENCE section (on the main floor), Cornell's STACKS (on the upper floor), or McCabe's STACKS. Be sure to be on the lookout for a + in the call number, as these books will be shelved in the OVERSIZED section (the shelves by Cornell's study tables upstairs).
Using subject-specific Encyclopedias and other Reference books (both in print & online) is a good way to give you subject ideas and get your research started. A good Encyclopedic article can give you a concise overview of your topic, and will often provide additional resources at the end of the article. Here are some examples of resources that can serve as a springboard for your E7 research:
WorldCat is an important place to look for many materials not owned by the Tri-College Libraries. This combined library catalog contains more than 62 million records describing items owned by libraries around the world. Many of these items are available to you though interlibrary loan