All the while a scientific disquisition on ammonia and the constituent parts and probable value of town sewage as compared with guano.
"Hodge and His Masters"
Richard Jefferies
Most farmers spread manure and some guano on their cropland, but correct chemical balances for specific crops were achieved only infrequently.
"Frying Pan Farm"
Elizabeth Brown Pryor
If it hadn't been for the guano birds there would have been no Grace Lines, now 100 years old.
"Epistles-from-Pap-Letters-from-the-man-known-as-The-Will-Rogers-of-Indiana"
Durham, Andrew Everett