Proceedings of the Royal Geographical Society and Monthly Record of Geography, 10 -LRB- 10 -RRB-, 613 -- 624 -LRB- 1888 -RRB-.
Proceedings of the Royal Geographical Society and Monthly Record of Geography, 10 -LRB- 10 -RRB-, 613-624 -LRB- 1888 -RRB-.