Abbreviations
- ABTB = Aartsdiocesane Boeren- en Tuindersbond = Archdiocesan farmers and market gardeners union
- BTL = Boeren en Tuinders Levensverzekeringen N.V. = farmers and market gardeners life insurance company
- LLTB = Limburgse Land- en Tuinbouwbond = Limburg agricultural and market gardening union
- LTB = vermoedelijk R.K. Diocesane Land- en Tuinbouwhogeschool in het Bisdom Haarlem = probably the Catholic diocesan agricultural and market gardening college in the bishopric of Haarlem
- NCB = Noordbrabantse Christelijke Boerenbond = Noordbrabant Christian farmers union
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