Observations - book - was created in 1959.
Observations - book - has 151 pages.
Observations on Man was created in 1749.
Observations in Time was created in 1969.
Observations - Pierre Belon - was created in 1553.
Darwin was famous for his "survival of the fittest" theory so obviously his observations about that were in his book.
"The Pillow Book", refers to a medieval Japanese diary, the book of observations by Sei Shonagon.
Book I was created in 2000.
The Book Lady was created in 2008.
The Book of Not was created in 2006.
A Book of Monsters was created in 1975.
Book M was created in 2001.
The Secret - book - was created in 2006-11.