Letters -pdf- - The Boron

Halbert's obsession with hyper-targeted mailing lists is the exact same concept as creating custom lookalike audiences on Facebook or targeting specific intent keywords on Google Ads.

The Boron Letters is a collection of letters written by Gary Halbert, a renowned copywriter and marketing expert, to his friend and fellow copywriter, Boron. The letters were written between 1967 and 1971, and they offer a unique insight into Halbert's approach to copywriting, marketing, and business.