Project Ultraswan

Describes the life of large trumpeter swans, how they nearly became extinct, and efforts to reintroduce them to the Northeastern United States and to help them relearn migration routes.

שנה

2002

שפה

English

סדרה

Scientists in the field

הוצאה

Houghton Mifflin Co.

מהדורות

4

עמודים

64

ISBN

9780618145287

מקור הנתונים: Wikidata