Upton Sinclair 
On Guard: Mark Mallory’s Celebration 

Upton Sinclair was a prolific American author who won the Pulitzer Prize for Fiction in 1943.  Sinclair wrote many well known books across different genres but his most famous is The Jungle, an influential novel that caused a public uproar and led to the Meat Inspection Act in 1906.   This edition of On Guard: Mark Mallory’s Celebration includes a table of contents.