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The date of a guide is, wherever possible, taken from the guide itself, often from a copyright notice and just as frequently by studying the text. Sometimes, the date is deduced by its place in a series of guides for that wildlife park or zoo, whilst other times it is the date of a visit to a collection and sometimes it's just a wild guess. It should be noted that the frequency that a zoo publishes and republishes a guide varies. There are periods when a new guide is published each year, sometimes followed by several years without a new publication. Occasionally, more than one guide per year will be published by the zoo. Sometimes a zoo will change the cover of its guide, but not its contents; while sometimes they retain the cover of the guide, but some of its content will be updated. Copyright notices tend to give you the earliest possible date of a guide, as the same text can be used in subsequent guides with (say) a change to the cover. The Zoo Guide Directory has tried to restrict its collection to guidebooks issued by the zoo or at the zoo. |
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