Fénix 16, 212-242

230 FENIX of both. Both methods would utilize the reproduction of the requisite number of copies from a prepared stencil through the means of a ditto, mimeograph, multilith, offset press, 01' similar stencil reproducing machinery, The method would differ only in the case Dí printing the copies. The question of economy in reproducing the information is important. One would need to weigh rapidity of reproduction by machine and the subse– quent cost against the cost of retyping and a more economical reproduction. Mechanical reproduction is rapid and comparatively error free. Retyping is cheaper, but it is slower and extremely susceptible to error. The most economical method perhaps is the ditto, 01' alcohol, reproduction, but it has the disadvantage of a small number of copies per stencil and the necessity to type the stencil. The mimeographs has the disadvantage of a typed stencil, but it has the advantage of a large numher of copies per stencil, One method, perhaps, that is fine, rapid, and economieal if the equipment is already available, is to shingle the cards in two columna onto a page one-third larger than the size that it desired; then to photograph the enlarged puge, reduc– ing it by one-third, and transferriug the image onto an offset master. Once the master is cleaned and set, it can be piaced on an offset press. Henee a cheap run can be achieved. If this method is used, the cards would be placed in order and sent to the reproduction area before they are filed in the union catalogo Another similar method would be to place the cards onto the plate of a Xerox 914 Copier and to transfer to image onto a multilith 01' offset master. The stencils can then be reproduced in huge quantities very cheaply. The 914 method has the disadvantage as compared with the reduction by photography in that les s cards appear on each page. Hence more pages are needed in the 914 method, raising the cost slightly. It has the advantage, however, in that a library is more likely to have a Xerox 914 Copier than a Xerox no. 4 camera. Bence to achieve the ideal that each cooperating library have an union catalog within its own locale, 1 have suggested that the union catalog issue at specified, regular intervals listings of the titles that are received at the union catalogo These lists can either be recopied by typewriter 01' reproduced by machi– nery such a cameras. The information can he listed alphabetica11y by author 01' by subject groupings 01' in any rnanner 01' combinations that might be desired. Probably these listings would be considered as temporary and would be cumulated at larger intervals into a more permanent format such as a printed volume. Probably, also, these temporary lists can be issued every two weeks 01' every month, and the printed copy each year. The question may arise whether to cumulate a11 of the printed volumes each year 01' whether to issue printed annual supplernents to a basic set of volumes, cumulating the complete set, say, every five years. The answer to this type of question is directly dependent UpOll the number of tittles received at the union catalog irr oue year, upon the cost of the printíng of the volumes, and UpOll the number of copies soldo From the aboye discussion 1 believe that you can see how you can solve the type of prohlem with Señorita Olivera and you are concerned: how to obtain Fénix: Revista de la Biblioteca Nacional del Perú. N.16, 1966