A plethora of books have been written on the subject.
<a biology textbook that is helpfully illustrated with a plethora of excellent illustrations>
There has been a plethora of plays in recent years whose claim to modernity is based on indicated rather than felt emotion. —Arthur Miller, Harper's, March 1999
The plethora of short-lived ceasefires in the Balkans and the Caucasus constitute proof that we are no longer in a world where the old rules of state warfare apply. —Robert D. Kaplan, Atlantic, February 1994
In their view, there are the very few hard-pressed good guys losing the landscape to a plethora of bad guys. —Carol Bly, Letters from the Country, 1981
… served at the long plank table in the banquet hut, amid a plethora of toasts to progress, amity, and the overthrow of imperialism—the meal passed in a blur. —John Updike, Trust Me, (1962) 1987