http://vocab.lternet.edu/vocab/vocab/http://vocab.lternet.edu/vocab/vocab/skos/262ice http://vocab.lternet.edu/vocab/vocab/skos/262 permafrost RT http://vocab.lternet.edu/vocab/vocab/skos/262 snow RT http://vocab.lternet.edu/vocab/vocab/skos/262 winter RT http://vocab.lternet.edu/vocab/vocab/skos/262 substrates BT