Subjects: eco
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- Latin America -- Economic conditions
- London (England) -- Economic conditions
- Marriage -- Economic aspects -- Fiction
- Marxian economics
- Mexico -- Economic conditions
- Mountain ecology -- California
- Mountain ecology -- Sierra Nevada (Calif. and Nev.)
- Northwest, Canadian -- Economic conditions
- Oceania -- Economic conditions
- Philippines -- Economic conditions
- Plant ecology
- Plant ecology -- Methodology
- Poland -- Economic conditions
- Pond ecology -- Juvenile literature
- Portugal -- Economic conditions -- 19th century
- Puerto Rico -- Economic conditions
- Queensland -- Economic conditions
- Rome -- Economic conditions
- Seashore ecology
- Skibbereen (Ireland) -- Economic conditions
- Slavery -- Economic aspects -- United States
- South Africa -- Economic conditions
- South America -- Economic conditions -- 1918-
- Southern States -- Economic conditions
- Soviet Union -- Economic conditions -- 1917-1945