The CATMOG reports describe advances in quantitative methods from the mid-1970s upto the early 1990s where many methods commonplace today were being developed. They represent core texts for those interested in the history behind quantitative methods in Geography. Writers include Stan Openshaw, Ron Johnston, Danny Dorling and many other renowned Quantitative Geographers. You can view all of the PDFs on GitHub. Alternatively you can download all of the CATMOG series together as a .zip file or a .tar.gz file.