Codes are used for priicing all publications. The code is determined by the number of pages ui the publieation Information pertain in^ to the pricing codes can be found in the current issues of the following pihlications. which are generally available in most libraries: Energy Research Absfrrbcts, (E M) ; Government Reports Announcementg and Index (UM and I); Scicnn'& und T&-IrnirAI A h~t r a~t Reports
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