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1861
Beckwith, Lieut …
Valley of the M …
Exploration Boo …
1861
Beckwith, Lieut …
Valley of Humbo …
Exploration Boo …
1861
Beckwith, Lieut …
Madelin Pass.
Exploration Boo …
1861
Beckwith, Lieut …
West End of Mad …
Exploration Boo …
1861
Beckwith, Lieut …
No. Slopes of t …
Exploration Boo …
1861
Beckwith, Lieut …
Portion, main m …
Exploration Boo …