Definition of field-book:
(n) :
A land area free of woodland, cities, and towns; an area of open country.
(n) :
(usually in the plural) The open country near or belonging to a town or city.
(n) :
A wide, open space that is used to grow crops or to hold farm animals, usually enclosed by a fence, hedge or other barrier.
(n) :
(geology) A region containing a particular mineral.
(n) :
An airfield, airport or air base; especially, one with unpaved runways.
(n) :
A place where competitive matches are carried out.