| She has been using heliography in her artworks for over ten years. |
| Bugles, flags, and heliography technology have advanced the means of control available to commanders. |
| After taking the pictures of various objects, I retired to my studio and start working on the pictures using the technique of heliography. |
| Our efforts in heliography have created considerable interest including that of the Solar Energy Division of Arizona's Department of Commerce. |
| A unique solar application that Lea teaches is heliography or sun printing. |
| And to this day, the discoveries of heliography continue to impact art, and art education. |
