Daida, D. 1981 Journal Mexico Nov. 4 to Mexico City where Duke is aware of a place to purchase liquid nitrogen. We drove west to Puebla and checked into the Hotel Lastra. The hotel is dear (a little expensive), but convenient, and it has an excellent and reasonable restaurant. Will drive into Mexico City tomorrow. We learned that at the end of the dirt- gravel road at the Puerto del Aire locality is the Veracruz - Puebla state line. It is marked with a large road painted white and none appear along the road. We have been collecting in [illegible] Veracruz, Nov. 5 Up early so as to get into Mex. City early to get the liquid nitrogen. We stopped in Rio Tinto for a fast breakfast in a good little restaurant just off the old road in Rio Tinto. We got into Mex. City in mid- morning, but had trouble getting thru the city and finding the nitrogen distributor - again. We finally parked the bus and Duke took a cab to the place and got the liquid nitrogen. We left to get out of town between 12:00 noon and 1:00 P. By following