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Bronze age --- Agriculture, Prehistoric --- Akkerbouw. --- Bronstijd. --- Paleobotanie. --- Bronze age - Hungary. --- Agriculture, Prehistoric - Hungary.

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Relation between energy and economics --- Biomass energy --- Biomasse --- Congresses --- Congrès --- -akkerbouw --- biomassa --- brandstoffen --- energie --- landbouwgewassen --- plantenteelt --- Bio-energy (Biomass energy) --- Bioenergy (Biomass energy) --- Biofuels --- Biological fuels --- Energy, Biomass --- Microbial energy conversion --- Energy conversion --- Fuel --- Energy crops --- Microbial fuel cells --- Refuse as fuel --- Waste products as fuel --- Congresses. --- Congrès --- akkerbouw --- Biomass energy - Congresses

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With a summary: weeds as environmental indicators, especially for soil conditions.

631.433.5 bodematmosfeer --- 632.5 onkruiden --- 632.51 distels --- 631.4 bodem --- 633 akkerbouw --- 632.51 --- 631.427.3 --- 504.064.3:574 --- Weeds --- Analysis by means of plants. Indicator plants --- Ecological warning systems. Bioindicators --- 504.064.3:574 Ecological warning systems. Bioindicators --- 631.427.3 Analysis by means of plants. Indicator plants --- 632.51 Weeds

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Crop yields --- Cultures de plein champ--Rendement --- Gewassen--Opbrengst --- Gewassen--Rendement --- Crops --- Crops yields --- Cultures --- Adaptation --- Evolution --- Plante de culture --- Évolution --- evolution --- History --- Domestication --- Rendement --- Yields --- Amériques --- Americas --- -Crops --- -Crop yields --- #KVIV:BB --- akkerbouw --- landbouwgewassen --- oogsten --- plantenteelt --- plantenveredeling --- Field crops --- Yields, Crop --- Agricultural productivity --- Soil productivity --- Agricultural crops --- Crop plants --- Farm crops --- Industrial crops --- Farm produce --- Plants, Cultivated --- Agronomy --- Crop science --- Plant products --- Crop yields. --- Plant and Crop Sciences. Plant Breeding and Genetics --- Adaptation. --- Evolution. --- Plant Breeding and Genetics (General) --- Plant Breeding and Genetics (General). --- Crop evolution --- Evolution (Biology) --- Adaptation (Biology) --- evolution.

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Agriculture Sciences --- General and Others --- Agriculture. Animal husbandry. Hunting. Fishery --- #ANTILTP9506 --- Landbouw (lt) --- agro-industrie --- $a63 --- Agro- en biotechnologie --- Biowetenschappen --- Landbouw --- Veeteelt --- landbouw 63 --- veeteelt 636 --- akkerbouw 633 --- mechanisatie 631.3 --- rundvee 636.2 --- varkens 636.4 --- 63 --- 631.2 --- 631.2 Farm buildings, structures and installations. Buildings for livestock, produce, machinery and equipment --- Farm buildings, structures and installations. Buildings for livestock, produce, machinery and equipment --- 63 Agriculture and related sciences and techniques. Forestry. Farming. Wildlife exploitation --- Agriculture and related sciences and techniques. Forestry. Farming. Wildlife exploitation --- Periodicals --- 63 Landbouw, veeteelt en verwante wetenschappen en technieken. Bosbouw. Landbouw. Exploitatie van dieren in het wild. --- Landbouw, veeteelt en verwante wetenschappen en technieken. Bosbouw. Landbouw. Exploitatie van dieren in het wild.