With so many computerized estimating systems being talked about these days, the straightforward basics of estimating are sometimes overlooked. Robert Petri's Construction Estimating: Easy Material Estimating Rules ($50 from R.W. Publishing, 201 Claire Ave., Fullerton, CA 92835; 800/758-0029) goes back to the basics by providing clear, concise explanations of material takeoff methods accompanied by helpful drawings. At almost 500 pages, this hefty guide covers both wood and light-gauge steel construction, and is well organized into 14 sections with more than 100 subsections. The index quickly guides readers to specific construction details. This is not a price book; it's a manual intended for prospective builders and tradespeople who need to learn or hone estimating skills. Environmental Primer for Developers As environmental issues affecting