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It is also dangerous to assume you can simply turn up and expect to see the material you need. Since there are pressures on storage space, many of the less popular documents in large archives are often kept offsite, which means you may not always be able to view material on the day you plan to visit unless you’ve made prior arrangements. In addition to storage restrictions, there could be other complications. Privately deposited documents – family papers, legal archives or religious collections – often come with their own restrictions. For example, you may need to write to the depositor to secure permission to view material. It is therefore vital to check all these details before you visit to avoid disappointment.