# The Sources Menu: Primary Object Types

The **Sources** selection menu allows you to search the two primary Object types, Antique Monument and Postclassical Work, either singly or in combination. The menu can be opened by accessing **Choose a Data Set** to the left of the search bar. By clicking on the arrow, a drop-down menu appears with the list of the two primary Object types. These can be activated or deactivated by clicking on the respective boxes: 

<figure><img src="/files/dFncSq0fMp6VWzMd3ZJE" alt="" width="375"><figcaption></figcaption></figure>

IMPORTANT: Below the object types, the **Census** pool is displayed. This pool contains all records of the Census database. If it is not activated, it is not possible to search the Census database.


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# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://docs.census.de/navigating-and-searching/data-sets-and-sources/the-sources-menu-primary-object-types.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.