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)))))))))))))) (. .)))
This book is a great introduction to American dialect and English. 
( ( This book ) ( ( is ( ( a ( great introduction ) ) ( to ( American ( ( dialect and ) English ) ) ) ) ) . ) )
(ROOT (S (NP (DT This) (NN book)) (VP (VBZ is) (NP (NP (DT a) (JJ great) (NN introduction)) (PP (TO to) (NP (NNP American) (NNP dialect) (CC and) (NNP English))))) (. .)))