Birds of North America Slipcase - Special slipcases were made to complement and house the complete set of the Birds of North America Life Histories for the 21st Century. They are now available individually for $10 each. They are black grained vinyl featuring gilt lettering and the Birds of North America logo. Each slipcase holds up to approximately 40 accounts. The slipcases measure 12in H x 8 3/4in D X 4 1/4in W.