- CollectionST - Forest of Dean Sculpture Trail Archive
- SeriesST/3 - Artists
- FileST/3/1 - Bruce Allan
- ItemST/3/1/1 - Signed copies of artist's contract of sale between The Forestry Commission and Bruce Allan for "Observatory"
- ItemST/3/1/2 - Photograph of Bruce Allan constructing Observatory
- ItemST/3/1/3 - Photograph of Bruce Allan sat on Observatory with children in background
- ItemST/3/1/4 - Photograph of side view of Bruce Allan sat on Observatory with people gathered around
- ItemST/3/1/5 - Photograph of person stood on top of Observatory
- ItemST/3/1/6 - Photograph of Observatory
- ItemST/3/1/7 - Photograph of Bruce Allan plus other standing on Observatory after safety modification
- ItemST/3/1/8 - Photograph of Observatory after safety modification
- 6 more...