Ottawa: National Museum of Sciences/National Museums of Canada, 1981. First Edition. Hardcover (25 x 18cm), pp.446, [2, blank]; blue cloth covered boards with white lettering on the spine, blue illustrated endpapers in illustrated dust wrapper.
Top edge a touch dust toned, bottom edge lightly scuffed; top corner of front board very gently bruised, bottom lightly abraded; spotting from verso of dust wrapper has caused very light marking to boards; edges of text block a little foxed; pages very slightly age toned, moderate spotting to endpapers, first six and last two pages easing to occasional spotting throughout, mostly along the top margins; unclipped dust wrapper is bright with light patches of spotting to the covers and heavy spotting to the verso. Item #942
A field guide and laboratory manual for shell collectors and scientists that describes and illustrates all the species of freshwater molluscs in Canada.