This book is a good introduction to the subject (in England); those familiar with dialectology in America, and those interested in the study in England or, indeed, generally would be well advised to add Word Maps to their libraries.
( ( This book ) ( ( is ( ( ( ( ( ( ( a ( good introduction ) ) ( to ( ( the subject ) ( -LRB- ( ( in England ) -RRB- ) ) ) ) ) ; ) ( ( those ( ( familiar with ) dialectology ) ) ( in America ) ) ) , ) and ) ( those ( ( ( ( interested ( in ( ( the study ) ( in England ) ) ) ) or ) ( , ( indeed , ) ) ) ( generally ( would ( be ( well ( advised ( to ( add ( ( Word Maps ) ( to ( their libraries ) ) ) ) ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT This) (NN book)) (VP (VBZ is) (NP (NP (NP (DT a) (JJ good) (NN introduction)) (PP (TO to) (NP (NP (DT the) (NN subject)) (PRN (-LRB- -LRB-) (PP (IN in) (NP (NNP England))) (-RRB- -RRB-))))) (: ;) (NP (NP (DT those) (ADJP (JJ familiar) (PP (IN with))) (NN dialectology)) (PP (IN in) (NP (NNP America)))) (, ,) (CC and) (NP (NP (DT those)) (VP (VP (VBN interested) (PP (IN in) (NP (NP (DT the) (NN study)) (PP (IN in) (NP (NNP England)))))) (CC or) (PRN (, ,) (ADVP (RB indeed)) (, ,)) (VP (ADVP (RB generally)) (MD would) (VP (VB be) (VP (ADVP (RB well)) (VBN advised) (S (VP (TO to) (VP (VB add) (NP (NP (NNP Word) (NNP Maps)) (PP (TO to) (NP (PRP$ their) (NNS libraries)))))))))))))) (. .)))
The book is a terrible introduction to the English language. 
( ( The book ) ( ( is ( ( a ( terrible introduction ) ) ( to ( the ( English language ) ) ) ) ) . ) )
(ROOT (S (NP (DT The) (NN book)) (VP (VBZ is) (NP (NP (DT a) (JJ terrible) (NN introduction)) (PP (TO to) (NP (DT the) (JJ English) (NN language))))) (. .)))