Robert L. Ehrlich, Jr. letter to J. P. L., March 12, 1992
Select what you would like to download. If choosing to download an image, please select the file format you wish to download.
Keyboard Shortcuts
Skip to main contentKeyboard shortcuts can be used to navigate aspects of this site without a mouse or cursor.
When viewing a document, select or tab into the image viewer and use the following controls to manipulate the image.
- Move up: w or [up arrow]
- Move down: s or [down arrow]
- Move left: a or [left arrow]
- Move right: d or [right arrow]
- Return to centre: 0
- Zoom in: = or [shift] + w or [shift] + [up arrow]
- Zoom out: - or [shift] + s or [shift] + [down arrow]
- Rotate clockwise: r
- Rotate counterclockwise: R
- Flip horizontally: f