المؤلفون: Young, Phoebe S.K., author

الإتاحة: https://doi.org/10.1093/oso/9780195372410.001.0001Test

المؤلفون: Young, Phoebe S.K., author

المصدر: Camping Grounds : Public Nature in American Life from the Civil War to the Occupy Movement, 2021, ill.

الإتاحة: https://doi.org/10.1093/oso/9780195372410.003.0004Test

المؤلفون: Collins, Richard B., author, Oesterle, Dale A., author, Friedman, Lawrence, author

المصدر: The Colorado State Constitution, 2020.

الإتاحة: https://doi.org/10.1093/oso/9780190907723.003.0027Test

المؤلفون: Dunlap, Thomas R., author

المصدر: In the Field, Among the Feathered : A History of Birders and Their Guides, 2012, ill.

الإتاحة: https://doi.org/10.1093/acprof:osobl/9780199734597.003.0006Test

المؤلفون: Dunlap, Thomas R., author

المصدر: In the Field, Among the Feathered : A History of Birders and Their Guides, 2012, ill.

الإتاحة: https://doi.org/10.1093/acprof:osobl/9780199734597.003.0004Test