Much has been said about concrete and its wide range of usage in the construction field but all too little has been said of the cost of labor for the installation of this important material. To combat this, a new book by John S. Page has been published entitled Estimator's General Construction Man Hour Manual. As an estimating tool there are two features which particularly contribute to this book: (1) it covers practically every type of concrete construction that will be encountered on residential, commercial and industrial building including forms, reinforcing steel and concrete placement. (2) Each table of man hour units contains adequate explanations of the specific operations covered. In order to use the tables intelligently, the user must first consider the productivity of his crew. The estimator should base his evaluation in terms of the percentage of the following six categories: general economy, project supervision, labor relation, job conditions, equipment conditions and weather conditions. The percentages should be add together and then divided by 6. The tables are based for a crew working at 70 percent efficiency. They would then be adjusted based on the productivity of the crew doing the work.