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TaxonomyBrowseInfoImagesLinksBooksData
Diptera of the superfamily Tipuloidea found in the District of Columbia
By Alexander, C. P. and McAtee, W. L
Proceedings of the United States National Museum, 58(2344): 385-435, 1920
Cite: 1308881 with citation markup [cite:1308881]
full text

I can't vouch for how useful this paper still is but it does contain keys to many genera