North with the Spring
Teale, Edwin Way
St. Martins, New York 1951
This book is part of a 4 volume set written over several years where the author and his wife set off on road trips across the country to follow the progression of a season. Spring was the first traveled and written, and it appears to have set the tone for the others. The general premise is that the author and his wife, both naturalists, write a naturalist biased travelogue as they go. Observations about the land, flora and fauna, weather, etc.. are interspersed with comments on the trip and places and people visited, meals eaten, etc.. which give the entire book a mix of scientific, travel, and history perspectives which works very well.
In Spring they began in Florida and worked up the east coast and Appalachians to the Canadian border.