English usage is a subject as wide as the English language itself. By far the greater part of usage, however, raises no controversies and poses no problems for native speakers of English, just because it is their natural idiom. But there are certain limited areas --particular sounds, spellings, words, and constructions--about which there arises uncertainty, difficulty, or disagreement. The proper aim of a usage guide is to resolve these problems, rather than describe the whole of current usage. The  Guide has this aim. Within the limits just indicated, it offers guidance in as clear, concise, and systematic a manner as possible. 

Remake PDF added Thanks to lanagreg

Oxford Heroes 3 WB

Oxford Heroes is a new three-level course for teenagers which takes them from beginner to intermediate level.
Every unit of Oxford Heroes  is divided into three complete lessons, providing a clear progression from new language to skills work.
The MultiROM is an Audio Cd and an Interactive CD-ROM

http://englishtips.org/1150851157-heroes-3-workbook.html

Oxford Heroes 3 SB

Oxford Heroes is a new three-level course for teenagers which takes them from beginner to intermediate level.
Every unit of Oxford Heroes  is divided into three complete lessons, providing a clear progression from new language to skills work.
The MultiROM is an Audio Cd and an Interactive CD-ROM

http://englishtips.org/1150857063-heroes-3-students-book.html

Oxford Heroes 1 TB

Oxford Heroes is a new three-level course for teenagers which takes them from beginner to intermediate level.
Every unit of Oxford Heroes  is divided into three complete lessons, providing a clear progression from new language to skills work.
The MultiROM is an Audio Cd and an Interactive CD-ROM

http://englishtips.org/1150818859-oxford-heroes-1-starter-sb-wb-tb-audio-cds.html

Oxford Heroes 1 SB

Oxford Heroes is a new three-level course for teenagers which takes them from beginner to intermediate level.
Every unit of Oxford Heroes  is divided into three complete lessons, providing a clear progression from new language to skills work.
The MultiROM is an Audio Cd and an Interactive CD-ROM

http://englishtips.org/1150818859-oxford-heroes-1-starter-sb-wb-tb-audio-cds.html