in the 1860s and 1970s was the number one expert on fish, wrote books about canada, on tone yo, fa farks very big to roosevelt. it came part of the family tradition being a conservationist. >> how did you convince or did you try to convince harper collins to publish 1000 page book in this economy that we in right now? >>> my vision is to do what is a quartet, america in the age of conservation with the first volume on tr, they don't like to promote multi-volumes because people feel it's a first volume we're not marketing it that way per se. i wanted to do something definitive, i've always loved multiple series of american and i realize we never have written a conservation history of the country and tr, because of all the day ris he department, looks he wrote was perfect person to do. i could have cut down in length. i would not have written about crater lake in oregon. petrified forest in arizona or not write about the bird refugees in florida. you have to cut the places he saved and i didn't want to do that. i thought my book is a chance for a major statement for people to understand th