We can see from this passage that the following topics have been mentioned in Pitch's book
A.Herbert Hoover was left out of a 1938 series of U.S. postage stamps about former presidents
B.there are four US cities that are state capitals named after presidents
C.President Bush was nicknamed' Lip' , because he wasn't afraid to voice his opinions on any subject
D.President Hoover was left out of the series of stamps because many people blamed him for prolonging the Great Depression