Occurrence of Attributes in Original Text

The text related to the cultural heritage 'Ir.D.F. Woudagemaal (D.F. Wouda Steam Pumping Station)' has mentioned 'Coal' in the following places:
Occurrence Sentence Text Source
In 1967 the 47 years old coal furnaces were converted to run on heavy fuel oil.
Woudagemaal, consisting of the pumping station with boiler house, chimney and coal storage depot, the inlet sluice at the Teroelsterkolk, the drainage canal (Afwateringskanaal), the outlet in front of the pumping station and at the inlet sluice, the sea dykes along the IJsselmeer with the pumping station itself functioning as a sea barrier, and the surrounding wide expanse of pasture lands has an outstanding value as a whole and is of high visual quality with respect to the landscape.
The only significant change has been the replacement of the eight original boilers by four larger-capacity installations in 1955 and their subsequent conversion from coal to fuel-oil firing twelve years later.
The pumping station with boiler house, chimney and coal storage depot is designated as a monument under the 1988 Monuments and Historic Buildings Act.