Grammar book

From Teflpedia

A grammar book - often just a grammar (i.e. when used as a countable noun) is a book about grammar.

Each grammar book uses a grammar schema. Grammar books may attempt to be comprehensive, covering all of English grammar, or partial, covering one or more main areas.

Often when someone refers to "an English grammar", what they may really be referring to is the grammar schema that it employs. Conceivably, different books could apply the same schema however, so the semantic mapping between the two may not be 1-1.