Just over 100 years ago, Machen fought to preserve core doctrines of the Church against attacks of liberal pastors and theologians who, under the guise of seeking coherence with modern science, sought to coopt individual churches and entire denominations by weakening the authority of the Bible and corrupting the gospel and the work of Christ. Christianity and Liberalism was a powerful argument against the enemies of the cross then and remains so today.
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This 70-page document includes the foreword, preface, chapter 1 (Introduction), and chapter 2 (Doctrine)
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A pdf of the entire book may be downloaded at archive.com. Hardback and paperback copies are available from the publisher. Several other inexpensive paperback editions are readily available elsewhere.