1840-1922 1856-1927 1970 19thcentury 20thcentury 944 aeronautics anthrax appreciation appropriationsandexpenditures aquaculture archives australia automotive bioterrorism birthcontrol brittany caillou(fictitiouscharacter) caillou(personajeficticio) canada canadapostcorporation canadianletters cancellations(philately) carriagesandcarts cartoonsandcomics censorship china chinesecharacters civilization civilservice coaching(transportation) collectivebargaining commerce commercial communication communicationandtechnology communicationandtraffic confederatestatesofamerica congresses correo costs countrylife covers(philately) criticismandinterpretationserao descriptionandtravel discworld(imaginaryplace) drama earthquakeprediction economicaspects economicrelationsinternationallaw education electronicmailsystems employees epistolaryfiction etc europe evaluation evaluationunitedstatespostalservice expressservice ficcionjuvenil ficciónjuvenil fiction finance fisheries foreignmail france french frenchletters frenchproseliterature gazetteers giovanni goldminesandmining greatbritain hainansheng harbors he6655a48142003 history historyamericanpostalworkersunion historyandcriticism historyroyalmailsteampacketcompany historyunitedstatespostalservice homosexuality imaginaryplaces insects internationalcooperation internationaleconomicrelations italian italy juvenilefiction juvenileliterature juvenilenonfiction labor laborunions landuse lawandlegislation letter-writing lettercarriers lettermailhandling letterwriting letterwritingrecreations literatureandsociety lotteries love madresehijos mailsteamers management managementunitedstatespostalservice maritimelaw matilde messengers militaryhistory mothersandsons museums musicals nationalpostalmuseum(unitedstates) nonfiction occupations oceanmailstamps oceanography officialsandemployees ontario ponyexpress popularculture population postagestamps postalcensorstamps postalrates postalstrike posthouses postmarks postofficebuildings privatization québec(province) railwaymailservice reorganization retirement ruralfreedelivery safetymeasures salaries scandals science scotland seismology shipping socialaspects sociallifeandcustoms sovietunion spain spanishlanguagematerials sports stampcollecting strikesandlockouts symbolisminpolitics technology telecommunication telegraph telegraphers telephone textileindustry timetravel transportation truckdrivers trucking unitedstates unitedstatespostalservice verga vocationalguidance writtencommunication