Indexing and Abstracting Services:
We have already discussed in Section the indexing and abstracting publications as secondary documents. The topic has also been discussed in detail in Unit 4 of BLIS 05. Suffice it to say here that many comprehensive indexing and abstracting services are available commercially and there may not be any need to provide in-house services. However, in many libraries in-house indexing and abstracting services are undertaken in response to some special needs, e.g., to cover special category of documents like, reports literature, working/ discussion papers. A good collection of indexing and abstracting publications will facilitate literature searching discussed in the following section. it also needs mention that most of the important indexing and abstracting publications are also available in machine (computer) readable format which can