More than 240,000 entries and 570,000 translations.

Harper Collins Sansoni Italian Unabridged Dictionary

Reference

Collins Jr., Henry H.

Dictionaries & Thesauruses

CollinsRef

1,741 questions arranged into 74 graded (easy to difficult) quizzes teach the beginning watcher what to look for and test more experienced readers on their knowledge of voices, eggs, flight patterns, nesting practices, range, habitat, unusual habits, etc. Answers. 51 drawings. 15 maps. Formerly Bird Watcher’s Quiz Book.

What Bird Is This?

Science & Math

Nature & Ecology

Dover Publications

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Books by Collins Jr., Henry H.