Tentative classification of plummets in the Lower Illinois River Valley. - o.O.

von Perino, Gregory
Veröffentlicht in Central States archaeological journal ; 8.1961, no. 2, S. 43-56 : 8 Ill.
1961.

A prehistoric archaeological record of the roseate spoonbill in Illinois. - Springfield, IL.

von Parmalee, Paul W.
Veröffentlicht in Transactions of the Illinois State Academy of Science ; 63.1970, no. 3, S. 254-258 : 2 Ill.
1970.