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By entering keyword(s), you may use one or more keywords to define a search using the words: and, or, not as separators.

To narrow a search, use: and, not.
mountain and river - will provide images that contain both mountain(s) and river(s).
mountain not river - will provide images that contain only mountain(s) without river(s).

To expand a search, use: or
mountain or river - will provide images that contain either mountain(s) or river(s) or both.

You may use filters in a keyword search:

Orientation - will provide images that are horizontal, vertical, or both. Clicking an orientation icon will automatically launch the search using the keyword that's in the text box. If the text box is blank, then the search will be done with the last keyword used.

Search within these results - When checked, this will and the new keyword with the previous search.

Search by Image ID - Enter the image id as a keyword. To search for multiple image ids, separate them with either commas or semi-colons.