Typogabor has a great collection of scanned in design and typography books as well as 'tributes' to the great Lou Dorfsmann and Herb Lubalin which are collections of some of their best work. It's a really good resource as books like the 'Top Symbols & Trademarks' are such good reference yet so hard to come by.
Via The Serif
https%3A%2F%2Fwww.deliciousindustries.com%2Fdesign-typography-resource
Delicious+Industries%3A+Design+%26amp%3B+Typography+resource