by Eckersley C.E.
ESSENTIAL ENGLISH is a course in four books for the teaching of English to adult foreign students. It aims at giving the student a sound knowledge of the essentials of both spoken and written English and taking him well on the way to a mastery of idiomatic conversational and literary English.
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http://usafiles.net/11lH/Essential_English_for_Foreign_Students_Book_1.pdf
http://usafiles.net/11lI/Essential_English_for_Foreign_Students_Book_2.pdf
http://usafiles.net/11lJ/Essential_English_for_Foreign_Students_Book_3.pdf
http://usafiles.net/11lK/Essential_English_for_Foreign_Students_Book_4.pdf