TY - RPRT TI - Space biology initiative program definition review. Trade study 4: Design modularity and commonality AU - Jackson, L. Neal AU - Crenshaw, John, Sr. AU - Davidson, William L. AU - Herbert, Frank J. AU - Bilodeau, James W. AU - Stoval, J. Michael AU - Sutton, Terry PY - 1989 UR - https://ntrs.nasa.gov/citations/19930013882 ID - 19930013882 ER -