Bookmarki Specializes in engineering, code books, estimating, standards, and assorted titles for the construction industry. http://www.bookmarki.com/

Builders References Books on estimating, official code including the NEC, CD estimating software, and how-to guides for the mechanical trades. http://www.buildersreferences.com/

Building Tech Bookstore, Inc. Technical bookstore serving the construction industry. http://www.buildingtechbooks.com/

Code Book City Code books for engineers, administrators, attorneys, and the construction trades. http://www.codebookcity.com/

CodeMole.com Offers codes and code-related materials and other books for the Electrical, Building and other Construction trades. http://www.codemole.com/

Construction Books Books and contracts on Architecture, construction, civil engineering, planning and surveying. Construction Books puts the bookshop online to your desktop. http://www.constructionbooks.net/

Contractor Books Reference books, plus videos, software and study guides for the construction industry. http://www.contractor-books.com/

HVAC Books HVAC books from technical publishers and HVAC book searches. http://www.books4hvac.com/

The Slate Book How to design, specify, install and repair a slate roof. Includes free subscription to the Slate Roof Quarterly. http://www.theslatebook.com/