Lee-the Howard Bond article was published in Photo-Techniques magazine. See if you can get a back issue from them. If not you can PM me and I will dig it out for you. Mr. Bond also did an article on Reciprocity several years ago on the older films; i.e. Tri-x,Tmax,Hp5 etc. His basic conclusion on the new films is that they don't increase nearly as much as the older films. They do increase as the times get longer though. See if you can find the article......if not then contact me.