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Click here for a larger and sharper version. Colleagues,
I recently acquired a map describing magnetic variation in the northeastern Pacific. The map includes a represenation of nearly all of North America, with the northwest coast incorporating knowledge gained from Cook's voyage but not Vancouver's. The map is sparse. With some certainty I've managed to identify the map as having come from a volume of eight maps, bound together as a book, with leather boards, attributed to the great naturalist Count Georges-Louis Leclerc Buffon. The title of each map reads,
Carte des déclinaisons et inclinaisons de l’aiguille aimantée redigrée d’après la table des observatrions Magnétiques faites par les Voyageurs, depuis l’Année 1775.
I would appreciate information any might have on this map and its siblings, particularly whether or not the volume was titled and whether the volume was in some way attached to Buffon's monumental "Histoire Naturelle des Oiseaux" or "Histoire Naturelle, Generale et Particuliere". Who was the engraver? Publisher? What year was the atlas published in?
Regards, and thanks in advance,