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Category:1921 in the environment

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Subcategories

This category has the following 5 subcategories, out of 5 total.

M

1921 meteorology (2 P)

N

1921 natural disasters (2 C, 2 P)
Non-renewable resource companies established in 1921 (1 P)

P

Protected areas established in 1921 (35 P)

S

Species described in 1921 (5 C)

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