To me that book, and the equivalents for Colombia were real eye-openers in showing what could be done for making books for true field use. Making them waterproof would be the next step that is still needed. But all those so-called FGs that one usually finds, some even burdened with long bibliographic lists etc., just show how too often various legitimate needs are crammed into one product. In the end, none of those needs is optimally served. The two-volume version that was fashionable for a short while at least for South America overdid it just a bit more. As not even the volume meant to be taken into the field was really compact. And having to rip those FGs apart, to essentially just take the plates into the field, while achieving its goal, simply makes any bibliophile's stomac churn.Very similar principle as the Field Book I mentioned in post #3. Given that it covers the entire country, it is more like 1/2 inch thick.