13. Opus Majus, _or_ Alchymia Major. 14.
13 - MAIN OXIDIZER VALVE 14 — MSBLS ELEVATION STATION RUNWAY 15 14 — OXIDIZER PREBURNER 16 — PARKING APRON 17 — RF COMMUNICATIONS TOWER 18.
13 - MAIN OXIDIZER VALVE 14 — MSBLS ELEVATION STATION RUNWAY 15 14 — OXIDIZER PREBURNER 16 — PARKING APRON 17 — RF COMMUNICATIONS TOWER 18.