1897 Mexico Mulita Covers

5736- 1897, CERTIFIED GUAYMAS, SONORA TO MEXICO

5750- 1892, MEXICO TO LONDON, WITH BACK STAMPS

5744- 1897, REGISTERED TO ST. LOUIS, US, (2) 10¢ STAMPS, FROM VERACRUZ, WAX SEAL ON BACK

5741- 1900, REGISTERED JUAREZ-CHIHUAHUA TO LOS ANGELES, BLACK INK STAIN LL

5733- 1897, OFFICIAL USAGE TO BELEN PRISION, FROM WHERE?