The following pages link to 1840 in birding and ornithology
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- List of years in birding and ornithology (links | edit)
- 1837 in birding and ornithology (links | edit)
- 1838 in birding and ornithology (links | edit)
- 1839 in birding and ornithology (links | edit)
- 1841 in birding and ornithology (links | edit)
- 1842 in birding and ornithology (links | edit)
- 1843 in birding and ornithology (links | edit)
- Talk:1840 in birding and ornithology (transclusion) (links | edit)