This impressive collection/library of Caterpillar Engine News publications spans a period of 25 years. This nearly complete collection begins with March 1984 publication and concludes with the last 'available in print' publication dated September 2009. My subscription was temporarily interrupted the first 9 months of 1999 due to a change of mailing address in. As a result, for the year 1999 this collection only includes publications issued for October & December. Despite the  interruption, with over 420 publications in total, this collection holds a wealth of knowledge and insights into the evolution of the Caterpillar product line.