Digging ditches in early medieval Europe

[1] ABELS RP, 1988, LORDSHIP MILITARY OB, P34

[2] AGGESEN S, 1917, SCRIPTORES MINORIAE, V1, P108

[3] Althoff Gerd, 1997, SPIELREGELN POLITIK, P1

[4] AMERON A, 1985, PROCOPIUS 6 CENTURY, P84

[5] ANDERSEN HH, 1984, ARCHAEOLOGISCHE NATU, V2, P191

[6] ANDERSEN HH, 1983, CHATEAU GAILLARD, V11, P9

[7] ANDERSEN HH, 1980, ARCHAOLOGISCHES KORR, V10

[8] ANDERSEN HH, 1976, DANEVIRKE, V2, P93

[9] ANGELOV D, 1980, ENTSTEHUNG BULGARISC, P97

[10] [Anonymous], 1989, FRONTIERES EMPIRE RO

[1] ABELS RP, 1988, LORDSHIP MILITARY OB, P34

[2] AGGESEN S, 1917, SCRIPTORES MINORIAE, V1, P108

[3] Althoff Gerd, 1997, SPIELREGELN POLITIK, P1

[4] AMERON A, 1985, PROCOPIUS 6 CENTURY, P84

[5] ANDERSEN HH, 1984, ARCHAEOLOGISCHE NATU, V2, P191

[6] ANDERSEN HH, 1983, CHATEAU GAILLARD, V11, P9

[7] ANDERSEN HH, 1980, ARCHAOLOGISCHES KORR, V10

[8] ANDERSEN HH, 1976, DANEVIRKE, V2, P93

[9] ANGELOV D, 1980, ENTSTEHUNG BULGARISC, P97

[10] [Anonymous], 1989, FRONTIERES EMPIRE RO