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The directory must have two main divisions - alphabetical and subject. In each of them on the card indicate the source. Alphabetical department cards have strict alphabetical order first words out without discrimination on account of meaning column. For the convenience of cards, if necessary, further dissect alphabetical dividers. Alphabetical order to quickly find any source, when it is known. Cards of this department, and if taken out to work, then immediately return, they must always be strictly in place, since the cards alphabetically department sometimes take notes indicating where to find this or that source. Thematic Catalogue Department should be divided headings (titles, brings together a group of cards on some common ground for them.) If, for example, look into the life and career of the writer and make extracts of the books about him, the directory be convenient dates in his life. When the subject of your training is more extensive topic, say, the history of technology, the catalog can be subjected to large sections of this topic (for example, the history of technology in Russia, Poland, Czechoslovakia, the development of these countries in a given age specific trends of thought, areas of technology and so on). Location cards within each column is subject to certain principles, such as alphabetical. Cards thematic units working directory mobile: they are taken out for work and regrouping, they reflect (and sometimes to reduce the text to apply the conditional, the shortest name) progress on the source, an assessment of its feasibility and ways of use. It also clarifies and location of the material - put down the page to which the reader will find something interesting. The card is useful to specify, for what purpose and what sections (chapters, paragraphs, pages, and even parts of them) will have to work out and when. Sometimes a card catalog of thematic units in the initial stages of work (view literature - sourcing and preliminary study of them) "roam" from one column to another. This is because one book title, articles can not always accurately represent their content. Moreover, sometimes the same card account for the same reason propagated in accordance with chapters or themes of the book or article.