1) "The Viking Rocket Story" by Milton W. Rosen - published 1955 - I have this
2) Magazine advertisement
3) "Structural Design Considerations for a High Altitude Sounding Rocket of the Viking Type"
        - by Richard C. Lea, The Glenn L. Martin Company, Baltimore, Md.- I have this
4) "The High Altitude Sounding Rocket" - by Milton W. Rosen & Richard B. Snodgrass, Naval
        Reserch Laboratory Washington, D. C. - I have this
5) "The Martin Star" - October, 1949 - I have this
6) "The Martin Star" - January, 1951 - I have this
7) "Rocket Research Report No. III Vibration in the Viking No.3 Rocket"