TY - BOOK TI - On NASA's Mars Sample Return Mission Options: Letter Report DO - 10.17226/12283 PY - 1996 UR - https://nap.nationalacademies.org/catalog/12283/on-nasas-mars-sample-return-mission-options-letter-report PB - The National Academies Press CY - Washington, DC LA - English KW - Space and Aeronautics ER -