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Scientific instruments (449) Staff (300) Accounting (Invoices, Accounts, ...) (214) Building Observatory (construction & maintenance) (148) Meteorology (122) About publications (105) General Administration (reports, regulations & inventories) (92) External publications (90) Foreign observatories (78) Meridian & time keeping (67) Budget (64) Astronomy (61) Study trips (59) Education (59) City of Brussels (57) Royal Academy (54) Cartography (+ topography & Geodesy) (52) Museum of Brussels (i. e. physics cabinet) (41) Personal life, family & friends (37) Foreign scientists and learned Societies (36) Statistics (+ BMI) (31) Justice & law (+ insurance) (29) Dépôt de la Guerre (Topographical Dépôt) (28) Telegraphy (26) Physics of the globe (25) Publications of the Observatory (23) Dutch government (1815-1830) (23) Belgian Navy (21) External performances (Commissions, committees, ...) (21) Homeland observatories (20) Library of the Observatory (18) Weights and Measures (17) High school of Brussels (16) Phenology (periodical phenomena : weather and nature) (14) Railways (14) Illustrations (14) Medicine (11) Belgian revolution (9) Museum of Industry (9) Mathematics (7) Miscellaneous (7) Military school (7) Telescopes (7) Royal Library (5) Demography (4) Botanical garden Brussels (3) Town planning (3) Learned Societies in Belgium (2) Belgian government (2) To correct (2) Industry (1) Biographies (1)