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Could it be Galactic Adventures?

One thousand of each type should suffice to clean out our Zwargs' nest for us. Half-an-hour later, Zebekee's preparations were ... Screeching with fury, the Zwargs fought ferociously as their stronghold was invaded on all four sides. .. [from Google Books]

The Google Books page has little bibliographic info (a 1980 pubdate and a partial table of contents). The ISFDB page says it was published by Rand McNally in 1980 (and has a different cover). Purnell apparently published the same book as Purnell's Book of Adventures in Space and the ISFDB entry is complete there.

The three stories are, respectively, "The Null-gravity Beam" by William Hall, "The Children" by Malcolm Hulke, and "Return of the Warriors" by John Grant.

Could it be Galactic Adventures?

One thousand of each type should suffice to clean out our Zwargs' nest for us. Half-an-hour later, Zebekee's preparations were ... Screeching with fury, the Zwargs fought ferociously as their stronghold was invaded on all four sides. .. [from Google Books]

The Google Books page has little bibliographic info (a 1980 pubdate and a partial table of contents). The ISFDB page says it was published by Rand McNally in 1980 (and has a different cover). Purnell apparently published the same book as Purnell's Book of Adventures in Space and the ISFDB entry is complete there.

The three stories are, respectively, "The Null-gravity Beam" by William Hall, "The Children" by Malcolm Hulke, and "Return of the Warriors" by John Grant.

Could it be Galactic Adventures?

One thousand of each type should suffice to clean out our Zwargs' nest for us. Half-an-hour later, Zebekee's preparations were ... Screeching with fury, the Zwargs fought ferociously as their stronghold was invaded on all four sides. .. [from Google Books]

The Google Books page has little bibliographic info (a 1980 pubdate and a partial table of contents). The ISFDB page says it was published by Rand McNally in 1980 (and has a different cover).

The three stories are, respectively, "The Null-gravity Beam" by William Hall, "The Children" by Malcolm Hulke, and "Return of the Warriors" by John Grant.

Could it be Galactic Adventures?

One thousand of each type should suffice to clean out our Zwargs' nest for us. Half-an-hour later, Zebekee's preparations were ... Screeching with fury, the Zwargs fought ferociously as their stronghold was invaded on all four sides. .. [from Google Books]

The Google Books page has little bibliographic info (a 1980 pubdate and a partial table of contents). The ISFDB page says it was published by Rand McNally in 1980 (and has a different cover). Purnell apparently published the same book as Purnell's Book of Adventures in Space and the ISFDB entry is complete there.

The three stories are, respectively, "The Null-gravity Beam" by William Hall, "The Children" by Malcolm Hulke, and "Return of the Warriors" by John Grant.

Could it be Galactic Adventures?

One thousand of each type should suffice to clean out our Zwargs' nest for us. Half-an-hour later, Zebekee's preparations were ... Screeching with fury, the Zwargs fought ferociously as their stronghold was invaded on all four sides. .. [from Google Books]

The Google Books page has little bibliographic info (a 1980 pubdate and a partial table of contents). The ISFDB page says it was published by Rand McNally in 1980 (and has a different cover).

Could it be Galactic Adventures?

One thousand of each type should suffice to clean out our Zwargs' nest for us. Half-an-hour later, Zebekee's preparations were ... Screeching with fury, the Zwargs fought ferociously as their stronghold was invaded on all four sides. .. [from Google Books]

The Google Books page has little bibliographic info (a 1980 pubdate and a partial table of contents). The ISFDB page says it was published by Rand McNally in 1980 (and has a different cover).

The three stories are, respectively, "The Null-gravity Beam" by William Hall, "The Children" by Malcolm Hulke, and "Return of the Warriors" by John Grant.