所谓工具书,实质就是回答问题的书,是人们所用的“问事书”。人们所能问的问题可以概括为六类,常用六个“W”来表述:what(问事物)、who(何人)、where(何地)、when(何时)、why(何故)、how(如何),不同的工具书回答不同问题。例如,词典主要回答what,人名录主要回答who,地图集主要回答where,百科全书、年鉴主要回答when、why、where等,手册、指南主要回答how,等等。集邮工具书通常包括:词典、百科全书、年鉴、手册、指南、目录等若干大类,由于集邮活动源于对邮票实物的收藏和研究,因而邮票目录具有显而易见的重要性和特殊性, The so-called tools, in essence, is to answer the book, people use the “question book.” People can ask questions can be summarized into six categories, commonly used six “W” to describe: what, who, where, when, why, how (How), different tools to answer different questions. For example, the main answer to the dictionary what, who answer the main answer who, the main answer to the atlas where, encyclopedia, the main answer when, why, where, manuals, manuals, the main answer how, and so on. Philatelic tools usually include several categories such as dictionaries, encyclopedias, yearbooks, manuals, guides, directories, etc. Since the stamp collecting activities originate from the collection and study of stamps in nature, the stamps catalog has obvious importance and particularity,