ACKNOWLEDGMENTThe authors owe a special debt of gratitude to Dr. Nicholas T. Mirov, who began this project before his retirement from the U.S. Forest Service in 1961. His many specific contributions, particularly to the information about the eastein and southeastern Asian species, are acknowledged in the text. D.r. Robert Z. Callaham has been helpful and encouraging throughout the preparation of this publication.

Acer barbatum Michx., Florida maple \

Base map with names of States of the United States, Provinces and other subdivisions of Canada, States of Mexico, and names of additional countries. 2 West Indies. Southern Florida with reference to the principal islands. 3 Southeastern United States (contiguous). Base map with names of counties. 4 Florida, with names of counties, county seats, and physical features.

first 32°F. temperature in autumn. Precipitation or Rainfall. Normal annual total precipitation (inches).Climates of the United States. Normal distribution of the principal climates in the United States. Precipitation effectiveness (P-E) index.

Volume 1. Conifers and Important Hardwoods Base Maps United States. Base map with names of counties, Provinces of Canada, and States of the northern part of Mexico. North America. Base map with names of States of the United States, Provinces and other subdivisions of Canada, States of Mexico, and names of additional countries. United States (contiguous), National Forest System, with names of National Forests and National Grasslands.