This is a Postcrossing Meetup card. It looks like they had a good turn out with about 15 ink stamps on the back. 

Ralph Waldo Emerson was an American essayist, lecturer, philosopher, minister, abolitionist, and poet. He was seen as a champion of individualism and critical thinking, as well as a critic of conformity.  Here is his poem Concord Hymn: By the rude bridge that arched the flood,     Their flag to April’s breeze unfurled, Here once the embattled farmers stood,     And fired the shot heard round the world. The foe long since in silence slept;     Alike the conqueror silent sleeps; And Time the ruined bridge has swept     Down the dark stream which seaward creeps. On this green bank, by this soft stream,     We set to-day a votive stone; That memory may their deed redeem,     When, like our sires, our sons are gone. Spirit, that made those heroes dare     To die, and leave their children free, Bid Time and Nature gently spare    ...

A couple of post ago I wrote about Naval Base Norfolk (4203), the largest naval base in the world. San Diego is home the second largest surface vessel naval base in the world, Naval Base San Diego. Naval Base San Diego is the principal homeport of the United States Pacific Fleet. The total on base population is 24 000 military personnel and 10 000 civilians. The following ships are homeported: Amphibious Assault Ships - 2, 4, 8, 20, 23, 25, 26, 27, 42, 45, 48, 49, 52 Cruisers - 59, 65, 70, 71 Destroyers - 54, 59, 60, 62,63,77,89, 90, 91, 92, 93, 97, 104, 106, 111, 123, 125, 1000, 1001, 1002 Littoral Combat Ships - 3, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, 28, 30, 32, 34, 36, 38 Supply & Support Ships - AKR-300, AH-19, AO-187, AO-202, AVB-4  

The sender says he has been to Canada several times. His card is a funny play on words.  Erding is a town of almost 37 000 people located north east of Munich. Agriculture is a big part of the local economy

The sender wrote a letter and included a vintage football card in plastic to protect it. The card is of Werner  Krämer (1940 - 2010), a West German footballer.  Krämer played 236 matches with Meidericher SV/MSV Duisburg from 1958 to 1967. From 1967-1969, he played 47 matches for Hamburger SV. His played for his last team, VfL Bochum (102 matches) from 1969 to 1973. He scored 86 career goals. He also has 13 caps play for West Germany from 1963 - 1967, where he scored three times. 

A great souvenir card from his travels to Hawaii, no doubt. The sender hails from Norfolk, a city of 240 000 people. It is home to Naval Station Norfolk, the world's largest naval base.  Naval Station Norfolk was established in 1917. Upon entering World War I, the base expanded quite quickly. During World War II, the base expanded again and included new runways for aircraft.  The following operational units are headquartered or homeported at Naval Station Norfolk: Carrier Strike Groups Two, Eight, Ten, Twelve Destroyer Squadrons 2, 22, 26, 28 Aircraft Carriers 69, 75, 77, 76 Cruiser 64 Amphibious Assault 1, 3, 5, 7, 17, 19, 21, 24, 28 Guided Missile Destroyers 55, 57, 58, 66, 67, 71, 72, 74, 76, 94, 95, 96, 98, 103, 107 Military Sealift Command AH-20, AKE-1, AO-195, AO-196, AO-201, AO-203, AOE-6, AOE-8, ARC-7, AOE-208, ESB-7 Submarines 752, 778, 779, 793, 804, 762, 764, 765, 785, 794, 796, 798, 800, 802